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Intraventricular arachnoid cyst

Report of two cases

Hiroyuki Nakase, Manabu Hisanaga, Shigeo Hashimoto, Masami Imanishi, and Shozaburo Utsumi

T wo cases of intraventricular arachnoid cyst were treated recently at our institution. Both patients suffered from continuous headache. The first was treated with cyst-wall fenestration and the second with a similar technique followed by placement of a cyst-peritoneal shunt. The symptoms cleared after surgery. Pathohistological examination showed loose connective tissue and arachnoid cells, compatible with the diagnosis of an arachnoid cyst. Case Reports Case 1 This 36-year-old man was admitted with a 2-month history of headache and nausea. He had

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Ashish Goyal, Anil K. Singh, Daljit Singh, Vikas Gupta, Medha Tatke, Sanjiv Sinha, and Sushil Kumar

A rachnoid cysts of the spine are often encountered as incidental asymptomatic findings. 6 They rarely cause spinal cord compression. 5, 6 Although the origin of these cysts is debated, it is likely that most arise from congenital defects in the distribution of the arachnoid trabeculae. 2, 4–6 They are more often situated extradurally than in an intradural extramedullary location, and they are not known to occur in intramedullary sites. To the best of our knowledge, no case report of intramedullary arachnoid cyst has been published. We report a unique

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Bizhan Aarabi, Gavril Pasternak, Orest Hurko, and Donlin M. Long

A rachnoid cysts are benign leptomeningeal diverticuli that can occur in the intradural, 4–6, 9, 10, 12, 13 extradural, 1–3, 8–11, 15 or perineural spaces. 14 Familial extradural arachnoid cysts associated with distichiasis and lymphedema have been reported before. 1, 2, 11 To our knowledge this is the first family reported with two members harboring intradural arachnoid cysts without distichiasis and lymphedema. 7 Case Reports Case 1 This 27-year-old woman was admitted to The Johns Hopkins Hospital in July, 1978, for evaluation of dull pain in

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Intradiploic arachnoid cysts

Report of two cases

Martin E. Weinand, Setti S. Rengachary, Douglas H. McGregor, and Itaru Watanabe

C ircumscribed lytic lesions of the skull pose a diagnostic challenge to the neurosurgeon and the radiologist. The differential diagnosis includes dermoid or epidermoid cyst, hemangioma, eosinophilic granuloma, plasmacytoma, and metastatic tumor. Although a tentative diagnosis is often possible based on the history, clinical course, and radiological features, the definitive diagnosis may not be established without an excisional biopsy. Two cases are reported of intradiploic arachnoid cysts which presented as lytic lesions of the skull. Based on

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John R. Little, Manuel R. Gomez, and Collin S. MacCarty

A lthough supratentorial arachnoid cysts are often asymptomatic and may be an incidental finding at autopsy, 19 the more rare infratentorial arachnoid cysts give rise to symptoms. This paper reviews the experience at the Mayo Clinic with arachnoid cysts in the posterior fossa. The first description of a supratentorial intracranial arachnoid cyst was given by Quain 18 in 1855. Arachnoid cysts in the posterior fossa were first reported by Maunsell 14 in, 1889. Under the term “chronic cystic arachnoiditis,” Craig 3 described the clinical picture of this

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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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Sameer H. Halani, Mina G. Safain, and Carl B. Heilman

arachnoid cysts exist and this continues to be a point of debate. 6 , 8 , 9 , 15 , 17 This study was approved by the Tufts Medical Center institutional review board. Case Reports We present 4 cases of communicating congenital prepontine arachnoid cysts in which a slit valve was identified in the wall of the cyst ( Table 1 ). The patients presented with a constellation of symptoms related to hydrocephalus, including a history of headaches, increasing head circumference, irritability, progressive memory loss, or progressive coordination problems. These 4 patients

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Sacral epidural noncommunicating arachnoid cyst

Case report and review of the literature

Nikolaos Sakellaridis, Demetrius Panagopoulos, and Helen Mahera

S pinal arachnoid cysts are rare. They are probably congenital and their pathogenesis remains unclear. Primary theories about the origins of these lesions indicate that they either represent a developmental anomaly of the perimedullary mesh 40 or a dural defect. 24 A splitting or rupture of the arachnoid mater and hydrodynamic factors have been posited as mechanisms for the formation of intradural cysts. 36 Arachnoid proliferation within the nerve root sleeve, leading to CSF flow obstruction, has been proposed as a main cause of Nabors Type II cysts. 28

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Henry W. S. Schroeder, Michael R. Gaab, and Wulf-Rüdiger Niendorf

A rachnoid cysts are intraarachnoid collections of cerebrospinal fluid. 7, 18 Mostly congenital in origin, they once were estimated to account for approximately 1% of all atraumatic intracranial mass lesions. 16 With the widespread use of magnetic resonance (MR) imaging and computerized tomography (CT), however, this incidence rate seems to be higher. 15 Although often an incidental finding, arachnoid cysts may cause neurological symptoms by compression of brain tissue. 16 Many operative procedures for the therapy of arachnoid cysts have been recommended

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Expansion of arachnoid cysts in children

Report of two cases and review of the literature

Ganesh Rao, Richard C. E. Anderson, Neil A. Feldstein, and Douglas L. Brockmeyer

C ontroversy about the appropriate treatment of arachnoid cysts stems from uncertainty regarding the cause and natural history of these lesions. 12 For asymptomatic arachnoid cysts that have been found incidentally, many authors advocate observation and serial imaging because most arachnoid cysts will remain stable in size and not require intervention. 9 Surgical treatment is usually indicated for patients with a focal neurological deficit attributable to the cyst or symptoms of increased intracranial pressure. 7 In infants, a head circumference that