Ependymal cyst

Both the neuroepithelial cyst and ependymal cyst have an epithelioid surface that is positive for S-100 protein and GFAP, resting on a fibrillary glial base that is also positive for these two antibodies. These cysts often occur near a ventricle (Table 20.13). They rarely cause aseptic meningitis. 

Ependymal cyst Columnar epithelium usually ciliated GFAP (+) Spinal cord brain... 

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