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Vol. 41, No. 4, 2005
Issue release date: July–August 2005
Pediatr Neurosurg 2005;41:220–223

Cerebellopontine Angle Arachnoid Cyst Harbouring Ectopic Neuroglia

Ariai S. · Koerbel A. · Bornemann A. · Morgala M. · Tatagiba M.
aDepartment of Neurosurgery and bInstitute of Brain Research, University Hospital of Tübingen, Tübingen, Germany

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Arachnoid cysts are collections of cerebrospinal fluid covered by arachnoidal cells and collagen. They may have a congenital or acquired origin. We present the case of a 7-year-old boy with a cerebellopontine angle arachnoid cyst harbouring a portion of neuroglia. Microscopically, the cyst wall consisted of a delicate fibrovascular membrane lined by a layer of arachnoidal cells. A thin layer of glial tissue ran the whole length of the cyst wall. This finding supports a congenital origin for this case. Cerebellopontine angle arachnoid cysts harbouring neuroglia without ependymal elements are very rare lesions and may be successfully treated by surgical resection.

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