The key issue is to distinguish a cystic mass that originates within the sella versus intrasellar extension from a suprasellar lesion (25-94). Extends beyond thyroid capsule to invades subcutaneous so tissue, larynx, trachea, esophagus, or recurrent laryngeal nerve Very advanced local disease. Approximately 60% grow very slowly (under 1 mm per year), whereas 10% of patients experience rapid enlargement of their lesions (more than 3 mm per year). The cardiomyopathy characteristic o Friedreich ataxia is not seen in Mohr- ranebjaerg. Most requent site is posterior plate o the cricoid cartilage, ollowed by the thyroid, arytenoid, and epiglottis. Global or generalized cerebral ischemia may result from hypoperfusion, hypoxia, membrane depolarization, or loss of cellular membrane integrity and ion homeostasis. Comprehensive body examination (lung, cardiovascular, skin changes/rashes/ lesions, musculoskeletal/joints) C. Activation and proliferation of astrocytes together with macrophage infiltration ensue. This prosthesis spans the distance between the stapes superstructure and the tympanic membrane. Eventually, massive parenchymal infiltration, blood vessel destruction, and tissue necrosis ensue. A discussion of classification systems is a recommended and practical approach to analyzing imaging. The surgical therapies are either destructive, or preservative o residual hearing. Paradoxical deviation of midline structures away from the craniectomy site is typical. While fractures can involve any part of the calvaria or skull base, the middle cranial fossa is most susceptible because of its thin "squamous" bones and multiple foramina and fissures. Some clotted blood is present, but much of the hematoma consists of isodense unclotted hemorrhage. The carotid artery may be gra ed i sacri ce necessary to clear margins versus leaving microscopic disease on the carotid adventitia. A ball-valve mechanism may entrap the air, which can be exacerbated by forcible sneezing, coughing, straining, or Valsalva maneuver. Excision should include the entire sublingual gland in order to prevent recurrence, with care taken to protect the submandibular duct and the lingual nerve. Divides into two bronchial buds which orm primitive primary bronchi, lower airway, and lung parenchyma. Clinical examination reveals rapidly spreading, erythematous skin changes with skin discoloration and subcutaneous emphysema. It is believed to ollow a more aggressive course than ollicular carcinoma overall, especially with respect to distant metastasis. The acial nerve and superior vestibular nerve are superior to this crest while the cochlear nerve and in erior vestibular nerve are in erior to this crest. Ampullopetal ow causes a greater response than ampullo ugal ow in the lateral canal. C mb nat ns var us drugs, such as benz d azep nes and p ds al ng w th pr p l, ketam ne, and et m date, can be t trated t the des red level c nsc usness. Surgery n these areas sh uld be c ntemplated i they are identied as c llapsing segments. Apnea a er tra he t my is due t arb n di xide nar sis ausing the medulla t be depressed. So is myxopapillary ependymoma, a tumor of young and middleaged adults that is almost exclusively found at the conus, cauda equina, and filum terminale of the spinal cord.
The inferior vermian veins collect tributaries from the inferior surface of the cerebellum and drain into unnamed tentorial sinuses near the torcular. Histiocytosis, plasma cell proli eration, and lymphophagocytosis may all be present. These range from a benign well-differentiated "mature" teratoma to an immature teratoma to a teratoma with malignant differentiation. Kaposi Sarcoma Patients have multiple idiopathic, hemorrhagic sarcomatosis particularly o the skin and viscera. Symptoms include moderate to severe otalgia (tender tragus), itching, aural ullness, hearing loss, otorrhea. The di erential diagnosis includes herpes simplex, pemphigus, acute usospirochetal stomatitis, chicken pox, monilial in ection, and secondary syphilis. Improvements in technology and re nements in candidacy criteria have secured a permanent role or cochlear implantation. The largest peak occurs during the third and fourth decades with a second smaller peak in patients-especially women-over the age of 50 years. The role of medical imaging in the emergent evaluation of intracranial infection ideally should be supportive, not primary. Do not intubate prior to visualizing or lesion may become compressed and go unnoticed. Patterned bruises, patches of torn hair, lip lacerations, and evidence of genital trauma raise the suspicion of inflicted injury and prompt appropriate imaging and consultation with the Child Protective Services team. Variable amount o bilateral hearing loss secondary to atrophy o the organ o Corti. It results rom the escape rom solution in the body uids o bubbles (mainly nitrogen) originally absorbed at higher pressure. Within 1 hour o administration, the patient may sense an improvement in the hearing loss, tinnitus, and sensation o ullness in the ear with maximum e ects occurring within 2 to 3 hours. Pathology A bluish sac beneath or just above the periosteum of the calvaria is typical. Tectal gliomas are frequently found in older children and young adults, typically presenting with symptoms of obstructive hydrocephalus rather than cranial neuropathy. Knowledge of this common normal variant is essential, as such asymmetry can mimic cerebrovascular pathology. Enterobacter species like Citrobacter are a common cause of cerebral abscess in neonates. In the first "prephase," a skull fracture (typically a linear or comminuted fracture) lacerates the dura, and brain tissue or arachnoid membrane herniates through the torn dura. The process may spontaneously remit, never occur again, and leave no residual or perhaps a mild hearing loss and tinnitus. All classifications are genetically trans mitted, and each is due to a specific gene mutation. By days 5-7, a necrotic core is surrounded by a poorly organized, irregular rim of granulation tissue consisting of inflammatory cells, macrophages, and fibroblasts. Patients with neurosarcoid are usually between 20-30 years of age or over 50 years of age and have diabetes insipidus if the pituitary axis is affected. Optic pathway/hypothalamic pilocytic astrocytoma is the second most common pediatric suprasellar mass. Laryngeal reinnervation: Most commonly, a branch o the ansa cervicalis is anastomosed to the distal recurrent laryngeal nerve. Moderate dys unction Gross Obvious, but not dis guring di erence between the two sides. The posterior pituitary "bright spot" is often absent, and the infundibular stalk may appear thickened (> 3 mm) and nontapering (24-36B). The cranio acial resection also allows or direct access or reconstruction o the skull base and dural de ect with a pericranial ap.
Furthermore, infections in the immunosuppressed patient have a propensity for perineural and perivascular spread. Follicular carcinoma, typically seen as small ollicular arrays or solid sheets o cells, has signi cant morphologic overlap with the benign ollicular adenoma. Most involve penetrating arteries in the basal ganglia/thalami, internal capsule, pons, and deep cerebral white matter. Depot injections o corticosteroids are discouraged by current guidelines due to potentially signi cant prolonged adverse e ects. Multifocal nodular enhancing masses or more diffuse perivascular infiltrates may develop (15-50). Neoplasms, Cysts, and Tumor-Like Lesions 676 Osteomas are seen as dense masses of well-demarcated mature lamellar bone. PapillonLe evre syndrome is periodontitis, hyperkeratosis o the soles o the eet and palms o the hands, and calci cation o the dura. Nasoseptal Flap (a) A vertical incision is made parallel to the anterior segment o the in erior turbinate. The temporal lobe is the most common site (nearly half of all cases) followed by the frontal (20%) and parietal lobes (15%). Spiral ganglion cells or axons appear to be the critical residual neural elements that are stimulated. The third group of pineal region lesions is composed of tumors of "other cell" origin. When properly delivered, external beam therapy can spare adjacent tissues and limit morbidity to the pituitary, eyes, ears, and rontal and temporal lobes. Nonatheromatous diseases of the cerebral vasculature are much less common than atherosclerosis and its sequelae. Electrophysiologic recurrent laryngeal nerve monitoring during thyroid and parathyroid surgery: international standards guideline statement. The life cycle of a malaria parasite involves the female Anopheles mosquito and a human host. Toxic Encephalopathy 927 (30-11) Autopsy specimen from a patient with MarchiafavaBignami disease shows necrosis in the middle layers of the corpus callosum, the classic pathology in this disorder. In older children and adults, over two-thirds of empyemas occur as extension of infection from paranasal sinus disease. Tiny enhancing miliary nodules or linear enhancing foci in the cortex and subcortical white matter indicate extension along the penetrating perivascular spaces. Can occur by direct invasion; lymphatic metastasis rom a nonsalivary gland primary; and hematogenous spread rom a distant primary. Grade 4 equates to stupor, moderate to severe hemiparesis, and an Clinical Issues Epidemiology. Lacunar Infarcts Terminology the terms "lacuna," "lacunar infarct," and "lacunar stroke" are often used interchangeably. Failure o laryngeal elevation: associated with neuromuscular disorders, generalized debilitation, and stroke (especially brain stem). Cochleosacculotomy is indicated in elderly patients, with disabling vertigo, poor hearing, and residual vestibular unction under local anesthesia. Diffuse leptomeningeal thickening with or without more focal nodular lesions is seen in about 40% of cases (15-47). Grade 2 represents moderate to severe headache with nuchal rigidity and/or cranial nerve palsy. Etiology Many head and neck cancers have a propensity to spread along nerve sheaths. In scalenus anticus syndrome, the symptoms are caused by compression o the brachial plexus and subclavian artery against the rst thoracic rib, probably as the result o spasms o the scalenus anticus muscle bringing pressure on the brachial plexus and the subclavian artery. Middle Ear e middle ear is an air- lled space approximately 5/8 inch high (15 mm), 1/8 to 3/16 inch wide (2-4 mm), 1/4 inch deep, and 1 to 2 cm 3 in volume. Near-total or total thyroidectomy without central node dissection may be appropriate or ollicular cancer. Passy-Muir valve aids in swallowing and helps prevent aspiration by increasing subglottic pressure.
The second pharyngobranchial duct (between the second and third arches) is believed to open into the tonsillar ossa, the third pharyngobranchial duct opens into the pyriorm sinus, and the ourth opens into the lower part o the pyri orm sinus or larynx. History Interview An important component of evaluating the pediatric patient is the history interview. The material is classi ed as either benign or suspicious based on a priori results to maximize sensitivity and negative predictive value. Direct Geographic Spread From Head and Neck Neoplasms Cephalad spread from head and neck neoplasms such as sinonasal squamous cell carcinoma, adenoid cystic carcinoma, non-Hodgkin lymphoma, and esthesioneuroblastoma may extend intracranially. Myoepithelial cells are located between connective tissue and acinar basal membranes (as well as intercalated duct cells) and contain both smooth muscle and epithelial cells and are rich in adenosine triphosphate (A P). More recent hypotheses implicate native stem cells of pluripotent or neural type as the source of neoplastically transformed germ cell elements. Patients with idiopathic intracranial hypertension commonly have an associated partially empty sella (25-21). Advantages (single-dilutional) * Highly sensitive Very low degrees o allergy can be detected. Meningeal disease may occur in adults with either acute or chronic myelogenous leukemia. Identi cation o an onodi cell is important in skull base surgery as this may be disorienting to the normal anatomy o the sphenoid sinus. In ection o lymph nodes (o Rouviere) in retropharyngeal space between visceral and alar asciae. Include decongestants, cromolyn sodium, and inhaled bronchodilators * Beta blockers Both topical and oral beta blockers can increase resistance to epinephrine, and as such should be avoided in patients undergoing testing or treatment or allergy. Loss o support o the upper lateral cartilages is common and may lead to internal valve stenosis and nasal obstruction. Cutaneous manifestations are common and include ker atoderma blennorrhagicum and mucocutaneous genital lesions and/or mouth ulcers. Lens dislocation: blurred vision; may occlude pupil causing angle closure glaucoma v. Loculated and/or multiple unilateral collections are more common than separate bilateral empyemas. The septal mucosa that is removed to create a window can be used as a ree gra over the exposed bone anteriorly. The m re elab rate test is a ardi pulm nary stress test, whi h inv lves measure exhaled gases and measures xygen nsumpti n. Wound complications including wound dehiscence, in ection, craniotomy bone ap loss and ree ap ailure are also common. Lower motor neuron facial palsy involves paralysis of all ipsilateral muscles of facial expression. It then synapses in the trigeminal (gasserian or semilunar) ganglion, a small crescent of tissue that lies at the bottom of Meckel cave. In time, other pediatric gliomas that appear similar to adult neoplasms may be given separate diagnostic categories. Subdural hygromas are sometimes detected within the first 24 hours after trauma; however, the mean time for appearance is 9 days after injury. Angiocentric, epithelial-type necrotizing granulomas with the presence o giant cells and histiocytes v. Symptoms depend on the direction o venous ow and volume o blood ow through the stula. Three-dimensional shaded surface displays are helpful in depicting skull and facial fractures.
Contrastenhanced images should be carefully evaluated for abnormal perimedullary vascular enhancement. Pineal parenchymal tumors and embryonal tumors with poorly differentiated proliferating neuroblasts, the last two subgroups of neuroepithelial tumors, are discussed in Chapters 20 and 21, respectively. The vast majority of H3 midline gliomas exhibit astrocytic morphology, but a wide spectrum of morphologic variations has been reported. The vascular channels enhance intensely, whereas the "dots" of bone spicules within the lesion do not. Ascher Syndrome Ascher syndrome is a combination o blepharochalasis, double lip, and goiter. If retrograde intracranial venous drainage is present, catastrophic subarachnoid hemorrhage from ruptured ectatic cortical veins can occur. Medial canthal tendons may need to be reapproximated with wire Maxillary ractures i. The dura mater consists of two layers, an outer (periosteal) and an inner (meningeal) layer. Episodic dizziness, diplopia, dysarthria, nausea, and visual disturbances are typical and are aggravated by exercise of the affected arm and shoulder. Chronic otitis media, with or without cholesteatoma, must be resolved be ore implantation. Cases of so- called "sentinel lesions" occurring up to 2 years after initial presentation with demyelinating lesions have been reported. Terminology Textiloma refers to a mass created by a retained surgical element (inadvertently or deliberately left behind) and its associated foreign body inflammatory reaction. There ore, a cle palate child with poor tensor palati unction is expected to have eustachian tube problems until the levator veli palatini starts to unction. It is the second most common infratentorial parenchymal mass in adults (after metastasis). Surgical removal of the extracranial component with cranioplasty is occasionally performed for cosmetic purposes. Melanoma, stomach, and colon cancers and lymphoma are less common causes of choroid plexus metastases. Although these parasitic infestations can occur at any age, they most commonly affect children and young adults. The suprameatal triangle o Macewen triangle is posterior and superior to the external auditory canal. During embryonic development, when a single tubal structure is to later become two tubal structures, the original tube is rst obliterated by a proli eration o lining epithelium, then as resorption o the epithelium takes place, the second tube is ormed and the rst tube is recannulized. Subtotal thyroidectomy, may rarely be appropriate depending on intraoperative parathyroid ndings in order to preserve parathyroid tissue. Gliomas-second only to meningiomas in incidence-are one of the most heterogeneous group of neoplasms. Radiographic eatures: radiolucent, single or multiple lesions, poorly de ned; teeth appear to be " oating in air" C. Induction chemotherapy plus radiation compared with surgery plus radiation in patients with advanced laryngeal cancer. I traction is required, it can be given as a ew pounds horizontally or several hours at a time. Normal structures are typically well corticated, and the underlying dura is normal. Pathway: utricle superior vestibular nerve vestibular nuclei medial longitudinal asciculus oculomotor nuclei (iii) in erior oblique muscle B. Intraparotid lymph nodes orm within the pseudocapsule o the parotid but lymph nodes do not orm within other salivary glands. Incidence o hearing loss ollowing in ection or vaccination is unknown but literature supports the association.
Thickened nails and onycholysis (separation of distal nail from the nail bed) are also common in psoriasis (Image 12-12). Impedance and admittance are opposite sides of the same phenomenon and yield the same information. Degenerated myelin (myelin "pallor"), axonal loss with increased extracellular fluid, lipofibrohyalinosis with small vessel occlusion, gliosis, spongiosis, and enlarged perivascular spaces can all be present in varying degrees. Etiology, endocrine (diabetes mellitus, adrenal disorders), dystrophic-metabolic (alcoholism, malnutrition) and neurogenic (anticholinergic medications). Irritants (dust, smoke), cold/dry air, alcohol, pregnancy, hypothyroidism and drugs cause congestion o capacitance vessels 1. Increases intra-abdominal pressure or de ecation, vomiting, and childbirth Re exes A. Focal hemorrhage is demonstrated at the caudothalamic groove, which represents the location of the greatest aggregation of germinal matrix tissue. Flap is less pliable than orearm ap due to thicker subcutaneous tissue, but may be tubed. Immature Teratoma Immature teratomas contain a complex admixture of at least some fetal-type tissues from all three germ cell layers in combination with more mature tissue elements (20-32) (2033). Perilymph Fistula In the absence o hearing loss, perilymph stula is a cause o vertigo. Treatment choice varies with the histologic type and number and location of metastases. Congenital immunodeficiency syndromes include Wiskott-Aldrich syndrome and severe combined immunodeficiency. Hereditary Congenital Dea ness Associated With Other Abnormalities Acoustic Neurinomas (Inherited) A. These cysts or cavities also often communicate via a "pore" with the subarachnoid space. Detects changes in its orientation relative to surrounding alternating-current magnetic eld D. The second and third growths are two arytenoid masses, which appear during the h week. As the e ects o the concussion reverse, the symptoms and objective ndings also move toward normal. Petrous apicectomy should be considered i in ection does not improve or intracranial complications are suspected. Superficial parts of the brain (cortex, subcortical white matter) are drained by cortical veins (including the vein of Trolard) and superior sagittal sinus (shown in green). Because of its high intrinsic metabolic demands, the brain is exquisitely sensitive to processes that decrease delivery or utilization of blood, oxygen, and glucose. The only statistically significant preoperative imaging predictor of patient outcome is evidence of tumor spread. In other instances, one is rustrated by an inability to adequately treat this condition. Etiology (5-21) Graphic depicts acute hypertensive striatocapsular hemorrhage with edema, dissection into the lateral and third ventricles. Systemic sarcoidosis has protean manifestations and is one of the great mimickers of many other diseases. As clinical manifestations, laboratory data, and imaging are all nonspecific, biopsy is mandatory for definitive diagnosis. Symptoms of pituitary/hypothalamic dysfunction such as diabetes insipidus or panhypopituitarism are seen in 10-15% of cases. Note volume loss with enlarged right frontal horn, gliotic brain surrounding old hematoma. Most common location is posteromedial oor (maxillary bone), medial to in raorbital neurovascular bundle. For example, if they occur in the subcortical white matter, the overlying gyri are enlarged with concomitant compression of adjacent sulci (28-38). Idiopathic in ammatory myopathies characterized by symmetric proximal muscle weakness ii.
In pneumocephalus, air can be found Differential Diagnosis Secondary midbrain ("Duret") hemorrhage may occur with severe descending transtentorial herniation. Technique (a) Begin with an anterior and posterior ethmoidectomy creating complete exposure o the skull base. Cowden disease: amilial goiter, skin hamartomata, and well-di erentiated thyroid carcinoma H. Cosmetic results are immediate, but there is a paucity o data on unctional outcomes. It may be black, blue, brown or white depending on micro ora and nicotine staining, and is o en associated with candida overgrowth. Symptoms include tracheobronchial compression, such as cough, dyspnea, hemoptysis, or dysphagia. Ongoing advances in tissue engineering o osseous, adipose, cartilaginous, and neural tissues hold promise or development o customized replacement tissues that can be trans erred with little to no donor site morbidity. Bruit, pulsatile exophthalmos, orbital edema, decreasing vision, glaucoma, and headache are typical (7-19). By analyzing data btained with a spir meter, the physi ian is able t determine whether a patient has n rmal r abn rmal lung un ti n. Dura is exposed anterior and 2 cm posterior to the sinus allowing compression o the sinus or improved exposure. Care is taken to mark out excess eyelid skin without excision o superior brow skin. Most neoplasms have a similar appearance on C; contrast allows discerning between a purely cystic lesion, lipoma, and a neoplasm. Lyon, France: International Agency for Research on Cancer, 2016, pp 324-328 Nonadenomatous Pituitary Tumors Hagel C et al: Immunoprofiling of glial tumours of the neurohypophysis suggests a common pituicytic origin of neoplastic cells. Consider rheumatology or pulmonology re erral Cha pter 44: the La rynx 791 Rheumatoid Arthritis A. Treacher Collins syndrome reacher Collins syndrome consists o acial mal ormations such as malar hypoplasia, downward slanting palpebral ssures, coloboma o the lower eyelids (the upper eyelid is involved in Goldenhar syndrome), hypoplastic mandible, mal ormations o the external ear or the ear canal, dental malocclusion, and cle palate. Feeding tube passed through nose down esophageal atresia with injection o air into pouch. Excess eyelid skin can be resected through a "skin pinch" where excess skin is gathered and excised below the lash line externally. The resulting diplopia and weakness of downward gaze causes most patients to compensate by tilting their heads away from the affected side. Both o these bacteria ound in same sinus in only 7% o patients, suggesting separate specimens should be obtained rom several sinuses. The ponticulum is the ridge o bone between the oval window niche and the sinus tympani. Close surveillance with colonoscopy is needed as there is a high rate o malignant trans ormation o colonic polyps. Extracalvarial extension under the Neoplasms, Cysts, and Tumor-Like Lesions 686 Contrast enhancement is marked but heterogeneous. In this age group, "blooming black dots" are most commonly caused by chronic hypertension or amyloid angiopathy. They may be described only as a "rash" or "eruption" over the knuckles (Image 12- 1 6). The patient presents with multiple p lyps, pulm nary in ltrati n with abs esses, and re tal pr lapse. Frequency bleed: of internal carotid artery (49%); common carotid artery (9%); external carotid artery (4%); miscellaneous (14%). It is a chronic in ammatory process involving mainly the salivary and lacrimal glands and is associated with hyperactivity o the B lymphocytes and with autoantibody and immune complex production. Intraparenchymal and intraventricular schwannomas occur but are extremely uncommon. It is pre erred in children because only the earmold has to be replaced as the child grows. Minor amounts of air in the intracranial venous systems is usually iatrogenic, introduced during intravenous catheter placement. National Institute for Health and Care Excellence Guideline: Diagnosis and management of headaches in young people and adults, 2012. The anterior and medial temporal lobes, insular cortex, subfrontal area, and cingulate gyri are most frequently affected (12-50A).
Other terms for this condition include subarachnoid hemosiderosis and sulcal siderosis. At histologic examination, markedly atypical cells with large round nuclei and prominent nuclei are found in small and medium-sized vessels (24-20). Neoplasms, Cysts, and Tumor-Like Lesions 852 Postcontrast T1 scans show meningitis-like findings. Neuromuscular Trans ers and Facial Slings (a) Indicated when there is irreversible atrophy o acial musculature. Ulcerations-seen as irregularly shaped contrast-filled outpouchings from the lumen-are detected with 95% sensitivity and 99% specificity. Anterior: pharynx and esophagus (middle layer o deep cervical asciabuccopharyngeal ascia). Neurosarcoidosis in an adult can cause a suprasellar mass that resembles germinoma. Supratentorial tumors with a propensity to bleed include ependymoma and the spectrum of primitive neuroectodermal tumors. Imaging findings of asphyxia in term infants vary with severity of insult, timing of imaging, and chosen modality. The tongue may show lobulations o its sur ace or, in advanced cases, be shiny, smooth, and red. Altered speech Clinical Assessment Direct examination o oral cavity rom anteriorly and using nasopharyngoscope rom posterosuperiorly. Peristalsis is diminished and poorly coordinated, and the esophagus may be dilated. The differential diagnosis includes intracranial hypotension, prior surgery, dural sinus thrombosis, chronic subdural hematoma, and residua of chronic meningitis (among the many entities that can cause this appearance on imaging studies). Extensive overlap in thyroglobulin levels exists between benign thyroid conditions and thyroid carcinoma. I obstructive symptoms are present nearly always involves xation o the vocal olds due to posterior scarring, anterior stenosis usually a ects voice more than respiration. Congenital immunodeficiency syndromes increase the risk of lymphoma, as does severe acquired immunosuppression. Between one-quarter and one-third present in adults with peak presentation in the fifth decade. Accidents are typically witnessed and more common after the child begins to ambulate. It results rom postganglionic sympathetic involvement in the area o the internal carotid artery or rom a lesion in the anterior portion o the middle cranial ossa. Conventional histologic criteria for malignancy (necrosis, nuclear atypia, pleomorphism, mitotic activity) are insufficient for diagnosis. For patients with lateral hooding, the incision should be extended superiorly rather than violating the thicker orbital skin. As with skin gra s, composite gra s are dependent on the recipient bed or neovascularization, and there ore are contraindicated in irradiated and in ected beds. Candidiasis of the mouth (thrush) causes white semi-adherent plaques on the tongue and mucosa. Downward and lateral retraction o the superior pole allows dissection in the interval between the thyroid cartilage medially and the superior pole laterally (cricothyroid space). Because they are anatomically constrained by the tough fibrous periosteum and its insertions, cephalohematomas rarely attain large size. Venous drainage directly into dural venous sinus or meningeal vein with venous re ux to normal subarachnoid veins; 39% have aggressive behavior. Un avorable ractures-displaced and distracted by pterygoid and masseter muscles Cha pter 54: Highlights and Pearls 1131 2. It has an autoimmune etiology with formation of anti-basement membrane antibod ies. The most frequent abnormality is the presence of petechial hemorrhages along gyral crests immediately adjacent to the calvaria. T yroglossal warrants excision o all contents between strap muscles (not just ollowing tract) down to and including pyramidal lobe o thyroid, plus resection o middle third o hyoid bone (Sistrunk procedure) with a cu o tongue muscle to minimize chances o recurrence. The most distal of the intratemporal facial nerve branches is the chorda tympani, which is affected first.
Return to Home Page