The patient went on to have endoscopic resection of the mass. 

Histology

MICROSCOPIC DESCRIPTION: Serial sections show a small fragment of glial tissue which  incorporates a slit-like space. This is lined by a more compact layer  of glial tissue staining strongly for GFAP but with focal staining for  epithelial membrane antigen. Scattered single siderophages are noted  in tissue adjacent to the space and there are also scattered Rosenthal  fibres. No evidence of tumour is seen. No pineal parenchymal tissue is  identified. The features are of pineal cyst/pineal glial cyst.   

FINAL DIAGNOSIS: Pineal cyst

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