Diffuse astrocytoma NOS (gemistocytic)
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A very large heterogenous mass occupies much of the frontal lobe on the left. It has areas of cyst formation with thin peripheral enhancement. On FLAIR the cystic areas demonstrate variable signal.
This case demonstrates fairly typical (pathologically-proven) features of a gemistocytic astrocytoma. Although they are considered WHO grade II tumors, they have a poorer prognosis than other grade II astrocytomas.