Anaplastic oligodendroglioma NOS
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A relatively well circumscribed mass involving the insular cortex on the left and surrounding brain is present. It has central areas which attenuate on FLAIR, and demonstrates no convincing enhancement.
The patient went on to have a craniotomy and biopsy which demonstrated an anaplastic oligodendroglioma.
Note: This case predates the recent (2016) revision WHO classification of CNS tumours, and thus molecular markers (IDH mutation and 1p19q co-deletion) are not available. As such, this tumour would now be classified as an anaplastic oligodendroglioma NOS.