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Amgad Hanna

ilioinguinal nerve (3) is seen proximal to the LFCN. A = femoral artery; F = femoral nerve. FIG. 4. Specimen 13. Left anterior thigh dissection revealing 2 LFCNs. One LFCN ( black arrow ) is 7 mm lateral to the ASIS ( red pin ), and the other ( black arrowhead ) is 5 cm medial to the ASIS. Note the femoral nerve ( white arrow ) medial to the LFCN. A unique finding in this study is that it defined a new fascial canal that completely ensheathes the nerve in the thigh. This was observed in all specimens (100%). There is 1 fascial plane superficial to the nerve

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Gene H. Barnett, Russell W. Hardy Jr., John R. Little, Janet W. Bay and George W. Sypert

S ymptomatic compression of the cord and cauda equina are recognized sequelae of acquired or congenital stenosis of the cervical or lumbar portions of the spine, respectively. Reports of myelopathy resulting exclusively from bone and ligament narrowing of the thoracic spinal canal are usually restricted to patients suffering from generalized disorders of bones or joints, such as achondroplasia, osteochondrodystrophy, acromegaly, Scheuermann's disease, osteofluorosis, or Paget's disease. We report four cases of the insidious development of thoracic myelopathy

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Jack E. Maniscalco and Mutaz B. Habal

T his report is based on a study of the optic canal and adjacent structures in 83 individual orbits. The purpose of this study was twofold: 1) to delineate the microanatomic structures and document their dimensions, and 2) to evaluate an extracranial route for optic canal exposure. Surgery of the orbital region and the optic canal requires detailed knowledge of the anatomy of the area and its normal variations. Widespread use of the operating microscope has enhanced the results and safety of established neurosurgical procedures. The extracranial approach to

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Mitchell J. Ramsey, Michael J. McKenna and Fred G. Barker II

S uperior semicircular canal dehiscence is an abnormal exposure of the vestibular membranous labyrinth in the middle cranial fossa. Superior semicircular canal dehiscence syndrome occurs when the loss of bone overlying the superior semicircular canal produces one or more of the following conditions: conductive hearing loss, acute pressure- and sound-evoked vestibular symptoms, and chronic dysequilibrium. In patients with disabling symptoms a craniotomy and repair of the dehiscent site improves the vestibulopathy. We present the case of a man who had superior

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Felix Umansky, Josef Elidan and Alberto Valarezo

T he anatomical relationships of the abducens nerve with the petrous apex in the petroclival region are of clinical interest. The relatively fixed position of the nerve within an osteofibrous compartment known as “Dorello's canal” makes it particularly vulnerable to several pathological conditions. Head injuries with or without fractures of the base of the skull, 3, 15, 19, 22 space-occupying lesions with shifting of the brain stem, 6, 7, 25 surgical trauma, 21 inflammatory disease of the petrous apex (Gradenigo's syndrome), 11 internal carotid artery (ICA

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Wenya Linda Bi, Ryan Brewster, Dennis Poe, David Vernick, Daniel J. Lee, C. Eduardo Corrales and Ian F. Dunn

S uperior semicircular canal dehiscence (SSCD) syndrome has been an increasingly recognized cause of vestibular and/or auditory symptoms in both adults and children since its initial description less than 2 decades ago. 60 Patients commonly present with vertigo, disequilibrium, conductive hyperacusis, autophony, conductive hearing loss, pulsatile tinnitus, or aural fullness. Dizziness can be associated with sound-induced (Tullio's phenomenon) or pressure-induced (Hennebert's sign) triggers. These symptoms are believed to result from the presence of a

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Darrell J. Harris, Victor L. Fornasier and Kenneth E. Livingston

contractile powers, are thought possibly to be related to smooth-muscle cells. Studies have shown the presence of bundles of filamentous structures within the cytoplasm of the tumor cells. 2, 15, 17 The neoplasms are found in the soft tissues of the body; they are uncommon in the cranial cavity and have rarely been shown to involve the spinal canal. 9, 16, 18 In this report we ldd three new cases with spinal canal involvement to the six already reported in the literature in an attempt to better characterize this uncommon lesion. Case Reports Case 1 This 28-year

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Kanwaljeet Garg and Rajinder Kumar

D ermoid cysts represent a rare group of tumors manifesting predominantly in adulthood. Rupture is well described in intracranial dermoid tumors. However, rupture of an intraspinal dermoid into the central canal is uncommon and in most cases asymptomatic. 4 , 12 We report 3 unusual cases of lumbar spinal dermoid cysts with asymptomatic rupture and migration of free fat droplets into the central canal. Case Reports Case 1 History and Presentation This 19-year-old male patient, who had undergone surgery for treatment of a lumbosacral

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Donald P. Becker, Jimmy A. Wilson and G. William Watson

T he exact site of cerebrospinal fluid (CSF) formation, in particular the site of active secretion, has not been determined. With newer techniques available to study CSF production quantitatively, 5, 10 there has been a renewed interest in this topic. Recent studies have suggested that the choroid plexus contributes to CSF production in only a limited way, and that the ependyma and/or cerebral tissue may be responsible for the major component of CSF formation. 8 The spinal cord central canal offers a model that may improve understanding of this problem. It

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Luigi Maresca, N. Bradly Meland, Carlotfa Maresca and E. Malcolm Field

G anglion cyst of the spinal canal has not previously been reported in the English literature. We are reporting such a case that appears to have arisen from the L4–5 vertebral facet joints. Case Report This 64-year-old woman was admitted because of low-back and leg pain. Examination . A straight-leg raising maneuver was mildly positive at approximately 80° bilaterally, and there was a positive dorsiflexion test. There were no motor, sensory, or reflex changes; mild to moderate bradykinesia was noticed, but there was no evidence of cogwheeling or