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James E. Boggan, Richard L. Davis, Greg Zorman, and Charles B. Wilson

C linically significant intrasellar cysts unrelated to pituitary adenomas are rare. 8, 25, 26, 35 We report the case of a typical epidermoid cyst, located within the sella, which on presentation mimicked a pituitary adenoma. Because there is still debate regarding the origins of epidermoid cysts in the sellar region and about their ontogenetic relationship to craniopharyngiomas and intrasellar epithelial cysts, we review briefly the relevant theories. Case Report This 41-year-old man was admitted to the Neurosurgery Service at the University of

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Robert J. Spinner, Marie-Noëlle Hébert-Blouin, Michael G. Rock, and Kimberly K. Amrami

I ntraneural ganglia are mucinous cysts most commonly found in the peroneal nerve near the fibular neck. The formation and propagation patterns of intraneural ganglia, long a curiosity and source of controversy, are being defined based on their articular (synovial) origin. 14 , 15 , 24 The fundamental principles of the articular theory for intraneural cyst formation include the following: 1) a synovial joint connection through a capsular rent into an articular branch; 2) dissection of fluid from a degenerative joint via the joint connection along the path

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Samuel F. Ciricillo, Richard L. Davis, and Charles B. Wilson

S ymptomatic intracranial neuroepithelial cysts are rare lesions thought to be of developmental origin that are seen most commonly in the anterior third ventricle. 17, 20 These lesions have been described as colloid, epithelial, ependymal, paraphyseal, choroid plexus, and choroidal ependymal cysts. Most patients present with symptoms of increased intracranial pressure caused by obstruction of cerebrospinal fluid (CSF) flow. While they may become symptomatic at any age, most neuroepithelial cysts are thought to form during embryogenesis from simple folding

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J. Hartley Bowen, Peter C. Burger, Guy L. Odom, Philip J. Dubois, and James M. Blue

A lthough meningiomas are usually solid, and exert only a displacing influence on the adjacent brain, some are associated with diagnostically confusing large cysts. 1–7, 9–11, 13–21, 23, 24 In many of these lesions, the neoplastic components are confined to mural nodules and the cyst walls are composed of reactive astroglial fibers 6, 11, 15, 18 or collagen. 5 Our encounter with two cases of meningiomas with adjacent cerebral cysts, in which neoplastic cells permeated the cyst wall, prompts us to suggest that the walls of such cystic lesions be resected and

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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

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John K. Houten, Scott P. Sanderson, and Paul R. Cooper

S ynovial cysts are lesions in which a synovial lining communicates with a joint capsule. In the lumbar spine synovial cysts arise from the facet joint and extend into the canal where they may compress the traversing nerve root to produce symptoms of radiculopathy indistinguishable from those induced by lumbar disc herniations. Excision has been recommended, and good outcomes have been reported in several retrospective series. 6, 13, 16, 18, 22, 29 There have few reports written of outcome in nonoperative cases, however, and little evidence exists to suggest

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Ercole Galassi, Francesco Tognetti, Franco Frank, Leo Fagioli, Maria Teresa Nasi, and Giulio Gaist

A rachnoid cysts are developmental collections of cerebrospinal fluid (CSF) contained within a lining leptomeningeal membrane. They can be found intracranially at any location adjacent to and frequently communicating with the subarachnoid spaces. The posterior fossa is their second most common location after the middle cranial fossa. 14, 15, 40, 42 Since the first description by Maunsell in 1889, 32 infratentorial arachnoid cysts have been reported many times; 2, 6, 8, 10, 12, 18, 20, 21, 24, 27, 28, 33, 34, 38, 46, 47, 49 however, only a few large series

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Satoshi Kawaguchi, Toshihiko Yamashita, Kazunori Ida, Tatsuru Ikeda, and Osamu Ohwada

T he collection of intradural gas in the spine is an unusual radiological finding. Thus far, three cases have been reported, all of which were caused by intradural herniation of a gas-containing disc. 1, 4, 11 In this report, we describe an additional case of an intradural gas-containing lesion, which showed radiological and histological features compatible with a gas-filled cyst rather than a gas-containing intradural disc herniation. Case Report History This 60-year-old man presented to a nearby hospital with a 1-month history of low-back pain that

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Congenital supratentorial cystic hemangioblastoma

Case report and review of the literature

Hakan Karabagli, Pinar Karabagli, Asude Alpman, and Burak Durmaz

these occurred in infants, three of them during the first 2 months of life. 1 , 6–8 , 11 , 13 Congenital supratentorial hemangioblastomas are rare tumors even in the pediatric population. 7 , 11 , 13 Supratentorial hemangioblastomas are usually intraparenchymatous (86%), less commonly intraventricular (6.6%) and rarely meningeal (5.6%). 1 , 12 Supratentorial hemangioblastomas appear more common in sporadic, non-VHL cases, but almost all of these tumors have been identified in adults. 6 We report a case of cystic, congenital supratentorial hemangioblastoma in a

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Takashi Shuto, Shigeo Inomori, Hideyo Fujino, Hisato Nagano, Naoki Hasegawa, and Yukio Kakuta

M eningioma is a common type of benign intracranial tumor but it is not always easily removed by surgery. Gamma knife surgery has become an important treatment modality for meningioma, especially in cases of skull base lesions. 3–6, 8, 10–13, 15–17, 20–22 Recently, however, it has become known that GKS may occasionally be associated with cyst formation following treatment for vestibular schwannoma 7 and arteriovenous malformation. 14 In addition, peritumoral edema occurs after GKS in approximately 10% of hemispheric tumors, such as convexity or parasagittal