Cerebellopontine Angle Arachnoid Cyst Harbouring Ectopic NeurogliaAriai S. · Koerbel A. · Bornemann A. · Morgala M. · Tatagiba M.
aDepartment of Neurosurgery and bInstitute of Brain Research, University Hospital of Tübingen, Tübingen, Germany
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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