Neda Zadeh, M.D.

• Children? Hospital of Orange County
• Orange, California

Abnormal differentiation of osteoblasts results in replacement of normal marrow and cancellous bone by immature "woven" bone and fibrous stroma gastritis symptoms acute metoclopramide 10 mg purchase without a prescription. The frontal bone is the most common calvarial site gastritis diet ����� order metoclopramide online, followed by the temporal bone gastritis vs gerd cheap metoclopramide, sphenoid chronic superficial gastritis definition 10 mg metoclopramide order with mastercard, and parietal bones gastritis sweating cheap metoclopramide american express. The orbit, zygoma, maxilla, and mandible are the most frequent sites in the face (26-1). Depending on the relative amount of fibrous versus osseous content, texture varies from firm and rubbery to "gritty. In the early stages, pronounced osteogenesis with thin osteoid anastomosing trabeculae rimmed with osteoblasts is seen. A stromal fibroblastic element with variable vascularity is interspersed between trabeculae of immature "woven" bone that resembles "Chinese letters. These include focal fatty metamorphosis (20-25%), myxoid stroma (15%), and calcifications (12%). It is the second most common pediatric primary skull lesion (after dermoid cysts). Monostotic lesions do not regress or disappear, but they generally stabilize at puberty. Radiation therapy is generally avoided, as it may induce malignant transformation. Intravenous bisphosphonate therapy has been used to ameliorate the disease course with some reported success. In general, very early lesions are radiolucent and then undergo progressive calcification, resulting in a "ground-glass" appearance. A pattern with mixed areas of radiopacity and radiolucency is found in almost half of all cases (26-4A) (26-5). Moderate hypointensity is characteristic of ossified and/or fibrous portions of the lesion (26-4B). Signal intensity following contrast administration varies depending on the lesion stage and ranges from no enhancement to diffuse, avid enhancement in active lesions (26-4C). Intraosseous meningiomas are more common in the calvaria than in the skull base and facial bones. A strongly enhancing en plaque soft tissue mass is often associated with the bony lesion. These include osteitis deformans, florid osseous dysplasia, focal cementoosseous dysplasia, and periapical cemental dysplasia. Paget disease typically occurs in elderly patients and usually involves the calvaria and temporal bone. PaD is characterized by rapid bone turnover within one or more discrete skeletal lesions. Etiology Genetic alterations occur in both classic Paget disease of the elderly and the uncommon familial Paget-like bone dysplasias that arise during childhood. The skull (both calvaria and skull base) is affected in 25-65% of patients (26-6). In the early lytic stage, active PaD is characterized by cellular fibroosseous lesions with minimally calcified osteoid trabeculae. Osteoclasts are numerous and larger than normal; they also have increased numbers of nuclei. In the inactive stage, bone turnover and excessive vascularity decrease and the trabeculae coarsen. It is especially prevalent in the United States, the British Isles, Canada, Australia, and some parts of Western Europe. Most patients are 5585 years of age with less than 5% of cases occurring in patients under the age of 40. Juvenile PaD, also known as idiopathic hyperphosphatasia, is an autosomalrecessive bone dysplasia. It begins in infancy or early childhood and is characterized by long bone widening, acetabular protrusion, pathologic fractures, and skull thickening. Presentation varies with location, and all bones of the craniofacial complex can be affected. Patients may present with either conductive (ossicular involvement) or sensorineural hearing loss (cochlear involvement or bony compression). Markedly elevated serum alkaline phosphatase is a constant feature, whereas calcium and phosphate levels remain within normal range. In the extracranial skeleton, osseous expansion with progressive skeletal deformity is typical. In comparison, craniofacial PaD generally has a more benign course and may remain asymptomatic for many years. Two neoplastic processes are associated with PaD: giant cell tumor (benign) and sarcoma (malignant). Giant cell tumor is an expansile intraosseous mass that usually occurs in the epiphyses and metaphyses of long bones in patients with longstanding polyostotic PaD. Most osteosarcomas are high grade and have already metastasized at the time of diagnosis. Bisphosphonates reduce bone turnover and have been effective in many cases of PaD. In the early active stage, radiolucent lesions develop in the calvaria, a condition termed osteoporosis circumscripta. Enlarged bone with mixed lytic and sclerotic foci and confluent nodular calcifications follows (the "cotton wool" appearance) in the mixed active stage. Mixed areas of bony lysis and sclerosis then develop, producing the "cotton wool" appearance (26-8). In severe cases, the softened expanded skull base can produce basilar invagination. Patchy enhancement on T1 C+ can occur in the advancing hypervascular zone of active PaD (26-9C). Sclerotic metastases may resemble PaD, but no trabecular coarsening or bony enlargement is present. The early lytic phase of PaD may resemble lytic metastases or multiple myeloma; neither enlarges the affected bone. Lesions can occur in the jaws (maxilla, mandible), petrous temporal bone, basisphenoid, and paranasal sinuses. Hemorrhages of varying ages with fluid-fluid levels are a prominent imaging feature, as are smaller cysts ("diverticula") that project from larger lesions. The surrounding rim and fibrous septa enhance following contrast administration (26-11). The dependent blood-fluid levels in the cysts are better appreciated on the axial scan. Pathology Chordomas are midline tumors that may arise anywhere along the primitive notochord. The sacrum is the most common site (50% of all chordomas) followed by the sphenooccipital (clival) region (35%) and spine (15%). Occasionally, a chordoma is predominantly extraosseous and arises off-midline, usually in the nasopharynx or cavernous sinus. Etiology Skull base (clival) chordomas probably arise from the cranial end of primitive notochordal remnants. Subpopulations of (26-12) Sagittal graphic shows an expansile, destructive, lobulated clival mass with a "thumb" of tumor indenting the pons. Neoplasms, Cysts, and Tumor-Like Lesions 828 Three major histologic forms of chordoma are recognized: conventional ("classic"), chondroid, and dedifferentiated. Conventional chordoma is the most common type and consists of physaliphorous cells that contain mucin and glycogen vacuoles, giving a characteristic "bubbly" appearance to its cytoplasm (26-13). Chondroid chordomas have stromal elements that resemble hyaline cartilage with neoplastic cells nestled within lacunae. Dedifferentiated chordoma represents less than 5% of chordomas and typically occurs in the sacrococcygeal region, not the clivus. Clinical Issues Chordomas account for 2-5% of all primary bone tumors but cause almost 40% of sacral tumors. Although chordomas may occur at any age, peak prevalence is between the fourth and sixth decades. Large chordomas may cause multiple cranial neuropathies, including visual loss and facial pain. Although they grow slowly, chordomas are eventually lethal unless treated with aggressive resection and proton beam irradiation. Chondroid chordomas exhibit the most favorable outcomes, whereas dedifferentiated tumors are associated with the most rapid progression and poor overall survival. Intratumoral calcifications generally represent sequestrations from destroyed bone. On sagittal images, a "thumb" of tumor tissue is often seen extending posteriorly through the cortex of the clivus and indenting the pons. Intratumoral calcifications and hemorrhage may cause foci of decreased signal within the overall hyperintense mass. Moderate to marked but heterogeneous enhancement is typical after contrast administration. Increased tumor-to-pons postcontrast signal intensity is associated with more abundant blood supply and increased risk of tumor progression. Ecchordosis physaliphora is a rare nonneoplastic notochordal remnant that may arise anywhere from the skull base to the sacrum. Neoplasms, Cysts, and Tumor-Like Lesions 830 and found incidentally at autopsy or imaging. They usually lie just in front of the pons and have a thin stalk-like connection to a smaller intraclival component (see below). Skull base metastases and plasmacytoma are destructive lesions that are usually isointense with brain on all sequences. It usually causes sclerosis and hyperostosis rather than a permeative destructive pattern. Ectopic notochordal rests can occur anywhere along the midline craniospinal axis from the dorsum sellae to the sacrococcygeal region. Neurenteric cysts are often slightly off-midline and somewhat lower, adjacent to the pontomedullary junction. Terminology Textiloma refers to a mass created by a retained surgical element (inadvertently or deliberately left behind) and its associated foreign body inflammatory reaction. The terms "gossypiboma," "gauzoma," and "muslinoma" refer specifically to retained nonresorbable cotton or woven materials. Neoplasms, Cysts, and Tumor-Like Lesions 832 Etiology Hemostatic agents can be resorbable or nonresorbable. All classes of resorbable and nonresorbable agents may produce textilomas as an allergic response. Resorbable agents include gelatin sponge, oxidized cellulose, and microfibrillar collagen. Although bioabsorbable hemostats are often left in place, nonresorbable agents are typically removed prior to surgical closure. Pathology Most textilomas occur within surgical resection sites or around muslinreinforced aneurysms. Histologic examination typically shows a core of degenerating inert hemostatic agent surrounded by inflammatory reaction. Each agent exhibits distinctive histologic features, often permitting specific identification (26-23C). Differential Diagnosis the major differential diagnosis is recurrent neoplasm or radiation necrosis. If present, T2 hypointensity helps distinguish textiloma from neoplasm or abscess. Definitive diagnosis typically requires biopsy and histologic examination with both routine stains and polarized light. Calcifying pseudoneoplasms are also known as fibroosseous lesions, cerebral calculi, "brain stones," and "brain rocks. They are discrete intra- or extraaxial masses that contain various combinations of chondromyxoid and fibrovascular stroma, metaplastic calcification, and ossification. The surrounding brain often exhibits inflammatory changes, with gliosis and edema leading to mass effect. A few cases have been reported in association with meningioangiomatosis and neurofibromatosis type 2. Solid, linear, serpiginous, and peripheral rim-like enhancement patterns have all been reported. Brain metastases are often ultimately responsible for patient mortality even in the face of controlled systemic disease. We include an updated discussion of how metastatic neoplasms of unknown origin are characterized in the era of targeted therapies for tumors such as non-small cell lung cancer and melanoma. Population aging, improved imaging techniques, and new treatment regimens that allow patients with primary systemic cancers to survive longer all contribute to this striking increase. Overview Terminology Metastases are secondary tumors that arise from primary neoplasms at another site. Metastases from extracranial primary neoplasms ("body-to-brain metastases") most commonly spread via hematogeneous dissemination. Direct geographic extension from a lesion in an adjacent structure (such as squamous cell carcinoma in the nasopharynx) also occurs but is much less common than hematogeneous spread.

Reduce immediately be ore swelling occurs or 5 to 7 days a er trauma when swelling subsides gastritis upper gi bleed discount metoclopramide 10 mg buy on-line. Button/disk batteries must be removed immediately due to risk o necrosis and septal per oration gastritis untreated buy 10 mg metoclopramide with mastercard. Bruising under eyes "allergic shiners" and "supratip crease" (rom rubbing nose upwards) common gastritis diet options order metoclopramide from india. Examination shows pale gastritis kronik adalah buy discount metoclopramide, boggy edematous mucosa gastritis symptoms flatulence cheap metoclopramide 10 mg on-line, in erior turbinate hypertrophy, thin clear rhinorrhea, +/- polyps. Pharmacotherapy (nasal saline, decongestants, steroid sprays, antihistamines, leukotriene inhibitors, mast cell stabilizers, anticholinergics) c. Pathogens include rhinovirus, coronavirus, adenovirus, and respiratory syncytial virus. First stage-presents in rst 3 months o li e with watery rhinorrhea which progresses to mucopurulent drainage. Second stage-presents later in childhood with "snuf es" and gumma ormation in nasal cavity. Open mouth posture leads to unopposed compressive action o masseter muscles on maxilla and overgrowth o molars due to lack o contact. X-ray (bene t: no scope or uncooperative children; risks: radiation, crying children elevate so palate which makes nasal aperture look smaller thus overestimating adenoid size. Recurrent obstruction ollowing surgery responds better to nasal steroids than prior to surgery. Complications o surgery include velopharyngeal insu ciency, bleeding, in ection, torticollis (Grisel syndrome), nasopharyngeal stenosis, Eustachian tube injury and atlantoaxial subluxation (ie, Down syndrome: avoid neck extension even i they have "normal" exion/extension cervical spine x-rays. Uncomplicated in ections due to: · S pneumoniae (30%) · H inf uenzae (20%) · M catarrhalis (20%) · S pyogenes (5%) 3. Risks o spread · Frontal bone (Pott pu y tumor) · Meningitis · Abscess (subdural, epidural, brain) b. Cultures rom middle meatus/ethmoid/maxillary sinus help ul i · Immunocompromised · Systemic illness · Progression despite appropriate therapy · Suppurative complications c. Related to allergy, chronic sinusitis or cystic brosis (see above) Neoplasms Most sinonasal tumors in children are benign. Extend laterally to pterygomaxillary space and superiorly to cavernous sinus and middle cranial ossa. Approaches include: 874 · · · · · Pa rt 6: Pediatrics Endoscopic (most common) LeFort I osteotomy and mid ace degloving Lateral rhinotomy ranspalatal Lateral in ratemporal ossa 3. Anterior 2/3 develops rom lateral lingual swellings (rst arch) and median tuberculum impar. Posterior 1/3 develops rom copula (second arch) and hypobranchial eminence (third and ourth arches). Bilateral Meckel cartilages begin intramembranous ossi cation on lateral aspect o mandibular symphysis. Medial nasal prominences use orming intermaxillary segment with our incisor tooth buds. Altered speech Clinical Assessment Direct examination o oral cavity rom anteriorly and using nasopharyngoscope rom posterosuperiorly. Inability o tongue to extend past red-white junction o lower lip may be predictive o success ollowing division. Frenulectomy (division) or renuloplasty (division plus suture closure o de ect) or eeding or speech issues. Care ul preservation o submandibular duct ori ce to prevent sialadenitis and lingual nerve to prevent numbness. Suspension microlaryngoscopy and surgical removal using laser, bipolar cautery (to minimize swelling) or microdebrider. Cystic swelling in vallecula between tongue base and epiglottis (extrinsic to tongue musculature). Suspension microlaryngoscopy and surgical removal using laser, cautery or microdebrider. Nager syndrome (Acro acial dysostosis) · Auricular anomalies including atresia · Malar hypoplasia · Downslanting palpebral ssures · Eyelid coloboma · Cle palate · T umb hypoplasia 4. Sphincter pharyngoplasty: superomedial rotation o bilateral muscle aps rom posterior pharyngeal wall to recreate Passavant ridge. Pharyngeal ap: superior rotation o midline muscle ap rom posterior pharyngeal wall with attachment to so palate. Purulent in ection o Weber glands in potential space between tonsil and pharyngeal constrictor. C scan o neck with contrast not routinely indicated but may help i clinical picture unclear or suspicion o spread. In ection o lymph nodes (o Rouviere) in retropharyngeal space between visceral and alar asciae. Lateral neck x-ray shows thickening o prevertebral tissue and loss o lordosis due to spasm o prevertebral muscles. T ickening greater than one hal the width o the vertebral body at the same level is pathological. C scan o neck with contrast distinguishes phlegmon (nondrainable) rom abscess (drainable) and helps de ne level and angle o entry or drainage. Signs and symptoms in children (di erent rom adults): · Heroic snoring · Pauses · Gasping · Neck hyperextension · Nocturnal diaphoresis · Nocturnal enuresis · Parasomnias (tooth grinding, sleepwalking) · Morning headache · Excessive daytime sleepiness · Attention de cit or hyperactivity · Poor school per ormance b. Impalement o oropharynx and palate usually rom running while holding sharp object. Risk o carotid injury (higher risk i injury lateral to anterior tonsillar pillar). Laryngotracheal groove divides into ventral (trachea) and dorsal (esophagus) components. Feeding di culties and weight loss (burn calories breathing and pre erentially breathe rather that eat). Inspect nose or aring, lips or cyanosis, neck or tracheal tug, chest or indrawing. May be associated with airway compromise (stridor, retractions, desaturation, cyanosis), eeding di culties and ailure to thrive. Redundant tissue over arytenoid cartilages due to inspiration against closed glottis leading to acid re ux. Pa rt 6: Pediatrics reating gastroesophageal re ux may break the cycle and improve respiratory symptoms. In ants with severe laryngomalacia (cyanotic episodes, ailure to thrive) may bene t rom supraglottoplasty. Reserve destructive procedures such as vocal cord lateralization, arytenoidectomy and posterior costal cartilage gra laryngotracheoplasty or longstanding bilateral vocal cord paralysis with respiratory distress or poor quality o li. Present with coughing with eeds (worse with thin liquids) and recurrent pneumonia. A deep interarytenoid notch that does not extend to the vocal olds may still cause aspiration requiring treatment. This is best per ormed using a transtracheal approach with placement o posterior costal cartilage gra and interposing ascia. This is best per ormed using cricotracheal separation to obviate the need or bypass with placement o interposing ascia. Do not intubate prior to visualizing or lesion may become compressed and go unnoticed. Histology demonstrates large usi orm or polygonal cells with abundant pale cytoplasm and marked cell membrane. Eosinophilic granules in cytoplasm may induce pseudoepitheliomatous hyperplasia which can be con used with squamous cell carcinoma. Recurrent croup (3 or more episodes) is unusual, suspect underlying subglottic stenosis. Recurrent croup warrants repeat high kV neck x-ray when in ection resolves (minimum 6 weeks ollowing in ection) to rule out underlying subglottic pathology. Consider rigid laryngoscopy and bronchoscopy i x-ray does not resolve this question. Rapid onset sore throat, ever, inspiratory stridor, respiratory distress, drooling, "tripod position" (hands on knees) due to inability to swallow secretions. Child should be accompanied in radiology suite by physician skilled at intubating. May involve any transition rom squamous to columnar epithelium such as mucosal abrasion, tracheotomy site, etc. Flexible nasopharyngoscopy shows exophytic protruberances on vocal old with multiple pinpoint dimples. Histopathology shows pedunculated, nger-like projections with brovascular core, covered by strati ed squamous epithelium). Flexible nasopharyngoscopy reveals abnormal vocal cord movement while awake and normal movement while asleep. May need to per orm nasopharyngoscopy while patient on treadmill to notice episode. Severe respiratory distress may warrant helium-oxygen therapy (heliox) to reduce airway turbulence, botox, or anticholinergic agents such as inhaled ipratropium. Counsel amily that the patient may pass out, but this will allow them to breathe again. Divides into two bronchial buds which orm primitive primary bronchi, lower airway, and lung parenchyma. Esophagotracheal septum regresses leading to separation o laryngotracheal tube and esophagus. Cha pter 47: Pediatric Otolaryngology: Head and Neck Surgery 891 Signs and Symptoms A. Some advocate exible bronchoscopy in the awake patient in clinic but this is still under investigation. Aortopexy to pull trachea anteriorly to decrease degree o trachealis obstruction being investigated. C chest with contrast and three-dimensional reconstruction o trachea and vasculature to con rm responsible vessel. Shortening o trachea (using slide tracheoplasty or resection) to alter relationship o trachea and o ending vessel. Coughing with eeds, cyanotic episodes, dysphagia, regurgitation, recurrent pneumonia. Feeding tube passed through nose down esophageal atresia with injection o air into pouch. Nasogastric tube inserted into esophagus and pulled backward up esophagus as contrast is injected under orce during uoroscopy. Air bronchogram (white outline o tracheobronchial tree) indicates presence o stula. Minimized by: · Less extensive mobilization o esophagus · Absorbable sutures · Complete division o tract rather than ligation · Noncontiguous tracheal and esophageal suture lines · Minimal tension on anastomosis · Interposing tissue between layers · Minimal postoperative trauma Cha pter 47: Pediatric Otolaryngology: Head and Neck Surgery 893 b. De-epithelialization o tract using electrical or chemical cautery with or without addition o brin glue. Associated with congenital heart disease, lung agenesis, duodenal atresia, and Down syndrome. Location: help ul to place scope at proximal end o stenosis, turn o room lights and visualize whether light is superior or in erior to clavicles. C with contrast and 3D reconstruction o trachea and vasculature helps to delineate extent o stenosis and associated cardiac anomalies. Should be per ormed by most experienced person with placement o endotracheal tube just below vocal cords. Reserved or severely symptomatic patients in rst ew months o li e or patients with poor exercise tolerance around age 5 years. Multiple exible bronchoscopies or bronchopulmonary lavage required ollowing surgery. Continuous smooth span o cartilage without tracheal rings or intercartilaginous ligaments. Initial episode usually involves coughing, gagging or sputtering, that usually resolves as oreign body moves past vocal cords. Dependent lung should collapse but looks hyperin ated i oreign body blocking bronchus. Suggest using only ollowing negative bronchoscopy where symptoms persist, to look or object in subsegmental bronchi and help plan next bronchoscopy. Persistent esophageal eosinophilia > 15 eosinophils per high power eld a er 2 months o proton pump inhibitor therapy or with normal pH study. Patchy or di use distribution o eosinophils through entire length o esophageal squamous mucosa. Fluticasone via metered dose inhaler without spacer is sprayed into mouth and swallowed. Care ul esophageal dilatation or strictures not responsive to medical management as may lead to per oration. Heliotrope rash over eyelids, Gottron papules over metacarpophalangeal joints and proximal interphalangeal joints. Li e-threatening skin condition whereby cell death leads to separation o epidermis rom dermis. Coating marshmallow in barium may detect nonobstructive object like shbone that may be missed with liquid contrast. Esophageal button batteries require emergent removal due to risk o lique action necrosis, per oration and stricture. Batteries that have passed into the stomach can be ollowed radiographically until they pass the rectum. May leave one magnet behind as long as there are no other magnets to be attracted to . Degree o injury related to type o corrosive, amount, concentration, duration o contact.

Subfalcine herniation should be proportionate to the size of the subdural collection gastritis pills cheap 10 mg metoclopramide. However gastritis kaffee buy discount metoclopramide 10 mg online, if the difference between the midline shift and thickness of the hematoma is 3 mm or more the gastritis diet 10 mg metoclopramide buy otc, then mortality is very high gastritis diet vs exercise discount metoclopramide amex. This discrepancy occurs when underlying cerebral edema is triggered by the traumatic event gastritis supplements 10 mg metoclopramide with visa. Early recognition and aggressive treatment for potentially catastrophic brain swelling are essential (2-35). This unusual appearance is found in extremely anemic patients (Hgb under 8-10 g/dL) (2-36) and sometimes occurs in patients with coagulopathy. The normally enhancing cortical veins are displaced inward by the extraaxial fluid collection. Some clotted blood is present, but much of the hematoma consists of isodense unclotted hemorrhage. Pathology A collection of partially liquified clot with resorbing blood products is surrounded on both sides by a "membrane" of organizing granulation tissue (2-37). The outermost membrane adheres to the dura and is typically thicker than the inner membrane, which abuts the thin, delicate arachnoid (2-38). In some cases, repetitive hemorrhages of different ages arising from the friable granulation tissue may be present. In others, liquefaction of the hematoma over time produces serous blood-tinged fluid. Imaging findings are related to hematoma age and the presence of encasing membranes. Sulcal effacement with displaced gray-white matter interfaces is the typical appearance. Trauma 32 T1 C+ scans demonstrate enhancing, thickened, encasing membranes (244D). Organization and resorption of the hematoma contained within the "membranes" of surrounding granulation tissue continue. Only a thickened dura-arachnoid layer remains with a few scattered pockets of old blood trapped between the inner and outer membranes. Older patients, especially those with brain atrophy, are subject to repeated hemorrhages. Dependent layering of blood within the loculated collections may appear quite bizarre. The hematocrit effect creates a slight gradation in density that increases from top to bottom. Therefore, the membranes show strong enhancement following contrast administration. Thickened dura-arachnoid residual clot is contained within a thin inner, thick outer membrane. The increased extraaxial spaces in patients with cerebral atrophy are predominantly frontal and temporal. Subdural hygromas are sometimes detected within the first 24 hours after trauma; however, the mean time for appearance is 9 days after injury. A subdural effusion is an accumulation of clear fluid over the cerebral convexities or in the interhemispheric fissure. Subdural effusions are generally complications of meningitis; a history of prior infection, not trauma, is typical. Tearing of cortical arteries and veins, rupture of contusions and lacerations into the contiguous subarachnoid space, and choroid plexus bleeds with intraventricular hemorrhage may all result in blood collecting within the subarachnoid cisterns. In mild cases, blood collects in a single sulcus or the dependent portion of the interpeduncular fossa. Clinical symptoms are primarily related to other traumatic injuries such as extraaxial hematoma, contusions, and axonal injury. In some cases, infusion of nimodipine or other calcium channel blockers such as verapamil may prevent vasospasm and its attendant complications. Posttraumatic interpeduncular or ambient cistern hemorrhage is a good marker for possible brainstem lesions in patients with otherwise unexplained coma and may warrant further investigation. Hypodense brain makes circulating blood in arteries and veins look relatively hyperdense (260). Parenchymal Injuries (2-61) Cortical contusions are located primarily along gyral crests, around a sylvian fissure. In this section, we again begin with the most peripheral injuries-cortical contusions-and work our way inward, ending with the deepest (subcortical) injuries. Cerebral Contusions and Lacerations Cerebral contusions are the most common of the intraaxial injuries. True brain lacerations are rare and typically occur only with severe (often fatal) head injury. The term "gliding" contusion is sometimes used to describe parasagittal contusions. The brain is suddenly and forcibly impacted against an osseous ridge or the hard, knife-like edge of the falx cerebri and tentorium cerebelli. Contusions are injuries of the brain surface that involve the gray matter and contiguous subcortical white matter (2-61) (2-62) (2-63). The temporal tips, as well as the lateral and inferior surfaces and the perisylvian gyri, are most commonly affected (2-64). The inferior (orbital) surfaces of the frontal lobes are also frequently affected (265). Convexity gyri, the dorsal corpus callosum body, dorsolateral midbrain, and cerebellum are less common sites of cerebral contusions. The occipital poles are rarely involved, even with relatively severe closed head injury. Contusions that occur at 180° opposite the site of direct impact (the "coup") are common and are called "contre-coup" lesions. Contusions range in appearance from small petechial to large confluent hemorrhages. Perivascular microhemorrhages rapidly form and coalesce over time into more confluent hematomas. Activation and proliferation of astrocytes together with macrophage infiltration ensue. Necrosis with neuronal loss and astrogliosis as well as hemosiderin-laden macrophages are present in subacute and chronic lesions. Cerebral contusions account for approximately half of all traumatic parenchymal lesions. Compared with diffuse axonal injuries (see below), cerebral contusions are less frequently associated with immediate loss of consciousness unless they are extensive or occur with other traumatic brain lesions. Hematoma expansion requiring surgical intervention occurs in approximately 20% of conservatively managed patients. Treatment options vary from observation with repeat imaging if the patient deteriorates to surgical evacuation of large focal hematomas. Craniectomy is performed in patients with severe brain swelling to prevent fatal brain herniation. Nearly half of all patients show an increase in lesion size and number over the first 24-48 hours. In the absence of clinical deterioration, however, the relevance of documenting this progression is debatable. The most frequent abnormality is the presence of petechial hemorrhages along gyral crests immediately adjacent to the calvaria. A mixture of petechial hemorrhages surrounded by patchy ill-defined hypodense areas of edema is common (2-66) (2-67). Lesion "blooming" over time is frequent and is seen with progressive increase in hemorrhage, edema, and mass effect (2-68). Development of new lesions that were not present on initial imaging is also common. In this case, the initial trauma was to the left parieto-occipital region at the site of the scalp hematoma. T2 scans show patchy hyperintense areas (edema) surrounding hypointense foci of hemorrhage (2-69A). Hemorrhagic contusions follow the expected evolution of parenchymal hematomas, with T1 shortening developing over time. Parenchymal volume loss with ventricular enlargement and sulcal prominence is common. Severe cortical contusion with confluent hematomas may be difficult to distinguish from brain laceration on imaging studies. Brain laceration occurs when severe trauma disrupts the pia and literally tears the underlying brain apart. Parenchymal brain laceration in infants and young children is typically associated with abusive head trauma (see below). Trauma 42 (2-72) Sagittal graphic depicts common sites of axonal injury in the corpus callosum and midbrain. A "burst lobe" is the most severe manifestation of frank brain laceration (2-70) (2-71). In some cases, especially those with depressed skull fracture, the arachnoid is also lacerated, and hemorrhage from the burst lobe extends to communicate directly with the subdural space, forming a coexisting subdural hematoma. The rapid deformation of white matter at the instant of trauma can lead to mechanical failure. A cascade of adverse events occurs, including calcium-dependent proteolysis of the axonal cytoskeleton in association with axonal transport interruption. Traumatic axonal stretching also causes depolarization, ion fluxes, and spreading depression. Amyloid precursor protein, excitatory amino acids, and proteolytic fragments of neurofilaments may be released. True "shearing" injury with frank axonal disconnection is uncommon and typically occurs only with very severe trauma. The cortex is typically spared; it is the subcortical and deep white matter that is most commonly affected. Lesions in compact white matter tracts such as the corpus callosum, especially the genu and splenium, fornix, and internal capsule, are frequent. Tears of penetrating vessels (diffuse vascular injury) may cause small round to ovoid or linear hemorrhages that sometimes are the only gross indications of underlying axonal injury (2-74). The cortex moves at a different speed relative to underlying deep brain structures (white matter, deep gray nuclei). Injury is designated as moderate when the lobar white matter and corpus callosum are affected. Prognosis correlates with the number and severity of lesions as well as the presence of other abnormalities such as cortical contusions and herniation syndromes. A few small round or ovoid subcortical hemorrhages may be visible (2-76), but the underlying damage is typically much more diffuse and much more severe than these relatively modest abnormalities would indicate. Cortical contusions are typically superficial lesions, usually located along gyral crests. Diffuse vascular injury (see below) appears as multifocal parenchymal "black dots. Several nontraumatic lesions also appear as multifocal T2* parenchymal hypointensities. The brain microvasculature, particularly long penetrating subcortical and deep perforating vessels, is disrupted by high tensile forces. Many more hemorrhages are detected on microscopic examination than are seen in the gross appearance of the brain. Blood is identified along periarterial, perivenous, and pericapillary spaces with focal hemorrhages in the adjacent parenchyma. Death within minutes or a few hours following injury is typical although some long-term survivors have been reported. In those who do, the most striking feature is the dissociation between clinical severity and imaging findings. A few small foci of hemorrhage in the white matter and basal ganglia can sometimes be identified. Dorsolateral midbrain injury occurs when it is suddenly impacted against the tentorial incisura. Occasionally, scattered hypointensities can be identified within the hyperintensities, suggesting the presence of hemorrhage. Punctate and linear "blooming" hypointensities are seen oriented perpendicularly to the ventricles, predominantly in the subcortical and deep white matter, especially the corpus callosum (2-80B). Additional lesions in the basal ganglia, thalami, brainstem, and cerebellum are often present. Many do not survive; those who do typically have profound neurologic impairment with severe long-term disability. Most represent severe shear-strain injuries that disrupt axons, tear penetrating blood vessels, and damage the choroid plexus of the lateral ventricles. Sudden craniocaudal displacement or lateral impaction of the midbrain against the tentorial incisura is common with these injuries. Minimal abnormalities may be present on initial imaging but show dramatic increase on follow-up scans. Between 5-10% of patients with moderate to severe brain trauma sustain subcortical injuries. Mass effect with cerebral herniation and gross disturbances in regional blood flow may develop. Intraventricular and choroid plexus hemorrhages are common and may form a "cast" of the lateral ventricles. Miscellaneous Injuries A broad spectrum of miscellaneous primary injuries occurs in head trauma. We conclude this chapter with a consideration of these miscellaneous lesions, as well as the topics of child abuse and gunshot wounds.

Syndromes

• Drainage or blood from the ear
• Have you always been intolerant of cold?
• Difficulty controlling crying or laughing (sometimes called emotional incontinence)
• Washing of the skin (irrigation) -- perhaps every few hours for several days
• Parasites
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• Jaundice continues to increase after the newborn visit, lasts longer than 2 weeks, or other symptoms develop

A few cases of mild posterior rim enhancement at the cyst-brain interface have been reported gastritis que puedo comer purchase metoclopramide amex. The center of the mass is just slightly offmidline gastritis ibs diet metoclopramide 10 mg with amex, a typical solution for a posterior fossa neurenteric cyst chronic gastritis what not to eat order 10 mg metoclopramide amex. Nonneoplastic Cysts 883 (28-24) Sagittal graphic shows a small cystic lesion within the pineal gland gastritis earth clinic cheap 10 mg metoclopramide with mastercard. These lesions gastritis vs ulcer purchase metoclopramide once a day, often seen in patients with vague complaints and no symptoms referable to the pineal region, can be troublesome to both radiologists and referring clinicians. Theories include persistent coalescing embryonic pineal cavities and glial degeneration with cavitation. An easy way to remember the normal midline anatomic structures in the pineal region-from top to bottom-is "famous V. The general appearance is that of a smooth, soft, tan-yellow pineal gland that contains a uni- or multilocular cyst (28-25). The inner layer is a sharply defined zone of finely fibrillar glial tissue with Rosenthal fibers. The inner surface of a pineal cyst cavity is often hemosiderin stained as the result of intralesional hemorrhage. The incidence among women ages 21-30 years is significantly higher than in any other group. A "thunderclap" headache may mimic symptoms of aneurysmal subarachnoid hemorrhage. Serial follow-up of indeterminate cystic lesions of the pineal region shows, in most lesions, no significant change in size or character over time intervals from months to years. Approximately 1-2% are very hyperintense, which may indicate intracystic hemorrhage. Thin-section high-resolution sagittal and axial T2 scans are especially helpful for detecting and characterizing lesions in the anatomically complex pineal region. Neoplasms, Cysts, and Tumor-Like Lesions 886 Differential Diagnosis the most common differential diagnosis is normal pineal gland. Normal pineal glands often contain one or more small cysts and can have nodular, crescentic, or ring-like enhancement. Pineocytomas can remain stable for many years without significant change on serial imaging. Surgeons sometimes call them "herald" cysts, as they are immediately adjacent to (and thus "herald" the presence of) a tumor mass. Once a cyst has been identified as lying within the brain itself, the differential diagnosis is limited. The most common parenchymal cysts-prominent perivascular spaces and hippocampal sulcus remnants-are anatomic variants. Cyst formation may also relate to blood-brain-barrier deficiency with peritumoral extravasation of water, electrolytes, and plasma proteins from altered microvessels. They are often asymmetric, may cause mass effect, and have frequently been mistaken for multicystic brain tumors. The cyst wall generally consists of gliotic brain with reactive astrocytes and lymphocytes. Most are solitary, but occasionally multiple loculated fluid collections are trapped at the tumor-brain interface. The common appearance is one or more "pools" of trapped fluid surrounding an extraaxial tumor mass (28-30). Enhancement is minimal or absent and generally related to reactive inflammatory changes in the cyst wall, not tumor. They are also common in the subcortical and deep white matter as well as the midbrain and dentate nuclei of the cerebellum. For example, if they occur in the subcortical white matter, the overlying gyri are enlarged with concomitant compression of adjacent sulci (28-38). Differential Diagnosis the major differential diagnosis is chronic lacunar infarction. This condition, called "état criblé" (cribriform state), should not be mistaken for multiple lacunar infarcts. Infectious cysts (especially parenchymal neurocysticercosis cysts) are usually small. These remnant cavities-hippocampal remnant cysts-are normal anatomic variants (28-40). Small blood vessels are often also included as the hippocampal sulcus forms, folds, and fuses. They appear as a "string of beads" with multiple small round or ovoid cysts curving along the hippocampus between the dentate gyrus and subiculum, just medial to the temporal horn of the lateral ventricle. Etiology At 15 fetal weeks, the hippocampus normally unfolds and surrounds an "open" shallow fissure-the hippocampal sulcus-along the medial surface of the temporal lobe. The walls of the hippocampal sulcus gradually fuse, and the sulcus is eventually obliterated. When they occur in the temporal lobe, enlarged perivascular spaces are found in the subcortical white matter of the insula and anterior tip of the temporal lobe, not medial to the temporal horn of the lateral ventricle. They are benign fluid-containing cavities buried within the cerebral white matter. They often lie adjacent to-but do not communicate directly with-the cerebral ventricles. Porencephalic cysts communicate with the ventricle and are lined by gliotic or spongiotic white matter. Arachnoid cysts are extraaxial, not intraaxial, and are lined with flattened arachnoid cells. Connatal cysts are cystic ependyma-lined areas adjacent to the superolateral margins of the body and frontal horns of the lateral ventricles. They are relatively common and generally innocuous lesions caused by coarctation or coaptation of the walls of the frontal horns. Etiology Porencephalic cysts are encephaloclastic lesions, the end result of a destructive process. Pathology Porencephalic cysts range in size from a few centimeters to cysts that involve virtually an entire cerebral hemisphere. Porencephalic cysts are deep, uni- or bilateral, smooth-walled cavities or excavations within the brain parenchyma. They are often "full-thickness" lesions, extending from the ventricle to the glia limitans of the cortex (28-45). Occasionally, a thin rim of ependyma or subependymal white matter may separate the cyst from the ventricle. Porencephalic cysts are relatively common, especially in children, in whom they represent 2. Spastic hemiplegia, medically refractory epilepsy, and psychomotor retardation are the most common symptoms. Occasionally a porencephalic cyst will continue to sequester fluid and expand, causing mass effect. Porencephalic Cyst Terminology "Porencephaly" literally means a hole in the brain. These cysts or cavities also often communicate via a "pore" with the subarachnoid space. The ipsilateral ventricle is often enlarged secondary to volume loss in the adjacent parenchyma. An encephalomalacic cavity is often more irregular and does not communicate with the adjacent ventricle. Porencephalic cysts are lined by reactive gliosis (glial "scar"), which occurs when histologically benign astrocytes proliferate in and around damaged brain parenchyma. A porencephalic cyst with surrounding reactive gliosis must be distinguished from spongiosis, a process that represents tissue loss (not astrocytic proliferation) with formation of empty (spongiform) areas ("holes") in the brain. Schizencephaly (literally "split brain") is a congenital lesion that can be either "open" or "closed lip. Hydranencephaly ("water on the brain") is a congenital lesion in which most of the supratentorial developing brain has been destroyed by arterial occlusion. Hydranencephaly is bilateral and symmetric, whereas most porencephalic cysts are unilateral or bilateral but asymmetric. Occasionally, large cysts may appear somewhat atypical and cause diagnostic concern. Acquired lesions are much more common; lipid that accumulates from desquamating, degenerating choroid plexus epithelium coalesces into macrocysts and provokes a xanthomatous response. Clinical Issues · Most common intracranial cyst · Most found incidentally · Most common in fetus/infants, older adults Clinical Issues Demographics. Irregular clumps of calcification around the margins are Nonneoplastic Cysts 895 (28-51) Axial graphic shows a classic colloid cyst at the foramen of Monro causing mild/moderate obstructive hydrocephalus. Note that the fornices and choroid plexus are elevated and stretched over the cyst. This may therefore represent pseudorestriction rather than true restricted diffusion. An enhancing, enlarged choroid plexus without frank cyst formation can also be seen with Sturge-Weber malformation, collateral venous drainage, and diffuse villous hyperplasia. Sturge-Weber and collateral venous drainage usually cause unilateral choroid plexus enlargement. Ependymal cysts generally displace and compress the choroid plexus rather than arise from it. Intraventricular parasitic cysts, specifically those of neurocysticercosis, are relatively uncommon. Although their precise etiology is unknown, they are presumed to arise from ectopic endodermal elements that migrate into the embryonic diencephalic roof. The roughly 10% that do enlarge tend to be larger lesions, often causing hydrocephalus, and found in younger patients. Incidental lesions rarely cause acute obstructive hydrocephalus or sudden neurological deterioration. Cyst "apoplexy" with intracystic hemorrhage and sudden enlargement occurs but is rare. Faint hyperintensity in the middle of the mass suggests inspissated mucous in a colloid cyst. Neuroendoscopic management has emerged as a safe, effective alternative to microsurgery with either a transcortical-transventricular or a transcallosal approach. The relative amounts of mucous material, cholesterol, protein, and water content all affect density/signal intensity. Approximately 25% demonstrate mixed hypo- and hyperintensity (the "black hole" effect). Large craniopharyngiomas and pituitary macroadenomas occasionally extend superiorly almost to the foramen of Monro. Most all of these neoplasms are diffusely infiltrating, nonfocal lesions that often show moderate to marked enhancement following contrast administration. Other third ventricle/foramen of Monro choroid plexus masses such as papilloma, xanthogranuloma, and choroid plexus cysts are rare. Phase artifact propagated across the image is helpful in establishing the etiology. Pathology Ependymal cysts are solitary lesions that are most often found in the atrium of the lateral ventricles, where they may cause significant ventricular asymmetry (28-57). Ependymal cysts are rare lesions, accounting for less than 1% of all nonneoplastic intracranial cysts. They are lined by a layer of simple columnar or cuboidal cells that are similar to the normal endoventricular lining. Clinical Issues Ependymal cysts are typically asymptomatic and discovered incidentally at imaging or autopsy. Large ependymal cysts occasionally cause obstructive hydrocephalus and increased intracranial pressure. Differential Diagnosis Except for location, ependymal cysts may be indistinguishable on imaging from other benign intracranial cysts such as neuroglial cysts. The major intraventricular mass that can mimic ependymal cyst is a choroid plexus cyst. Choroid plexus cysts are typically bilateral, often multilocular, and located within the choroid plexus glomi. Ependymal cysts arise outside the choroid plexus and usually displace it superolaterally. Arachnoid cysts are identical to ependymal cysts in density and signal intensity but are rarely intraventricular. Cystic metastases to the choroid plexus are rare; nodular or irregular rim enhancement is typical. Nonneoplastic Cysts Selected References Extraaxial Cysts Ajtai B et al: Imaging of intracranial cysts. Patients who present acutely with encephalopathy may have unknown or undiagnosed metabolic derangements. Metabolic disorders are relatively uncommon but important diseases in which imaging can play a key role in early diagnosis and appropriate patient management. Recognizing toxic and metabolic-induced encephalopathies has become a clinical and imaging imperative. The two etiologies are often linked because many toxins induce metabolic derangements and some systemic metabolic diseases have a direct toxic effect on the brain. With rapidly increasing numbers of aging people, the prevalence of dementia and brain degeneration is also becoming a global concern. Brain scans in elderly patients with mental status changes are now some of the most frequently requested imaging examinations.

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