Anaplastic oligodendroglioma NOS
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A mass which involves the cortex is present within the left frontal lobe. it demonstrates wispy heterogeneous contrast enhancement and moderate restricted diffusion. Some areas of signal loss likely represent calcification.
This patient went on to have a craniotomy which confirmed the diagnosis of an anaplastic oligodendroglioma.
Note: This case predates the recent (2016) revision WHO classification of CNS tumors, and thus molecular markers (IDH mutation and 1p19q co-deletion) are not available. As such, this tumor would now be classified as an anaplastic oligodendroglioma NOS.