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A large ill defined infiltrative lesion is seen involving the right cerebellar hemisphere and extending through the middle cerebellar peduncle to involve the right hemipons. This lesion displays iso intense signal in T1 and hyperintense sginal in T2 with mild diffusion restriction as shown in DWI and ADC map. Post contrast study reveals a moderately enhancing nodule at the periphery of the right cerebellum however most of the lesion lack contrast enhancement.
Microscopy: diffuse astrocytoma (Fibrillary type) degenerated into anaplastic astrocytoma ( WHO Grade III)