Glial cysts

Glial cyst, simple cyst. Wall of gliosis Rosenthal GFAP in glial filaments (-I-) Pineal, cerebellum. 

Cysts differ from tumors in their lack of a solid nodule of tissue. This simple fact is critical to distinguishing glial cysts from gliomas and epithelial cysts from cystic craniopharyngiomas. Cysts specific to nervous tissue are emphasized here. Others are described in their primary chapters. 

Glial Cyst, Simple Cyst, Pineal Cyst, and Wall of Syrinx... 

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. 

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