Diffuse astroctyoma NOS
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A low T1, high T2 signal mass is present on the left centered on the insular cortex with mild positive mass effect. No enhancement.
The patient had a craniotomy and resection of the mass.
Several fragments of white matter are hypercellular and show loss of the normal white matter architecture. Within these fragments, there is a proliferation of mildly atypical astrocytic cells. These have enlarged irregularly shaped hyperchromatic and vesicular nuclei and delicate processes. No mitotic figures are seen and there is no evidence of vascular endothelial cell proliferation and no necrosis. Prominent perineuronal secondary structuring is noted in some areas of cortex.
FINAL DIAGNOSIS: Diffuse astrocytoma (WHO grade II).