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.
Note: IDH mutation status is not provided in this case and according to the current (2016) WHO classification of CNS tumors, this tumor would, therefore, be designated as a gemistocytic astrocytoma NOS.