Oligoastrocytoma NOS (anaplastic)
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Heterogeneous right temporal mass with a cystic hemosiderin stained component and areas of contrast enhancement. The dominant component is non-enhancing tumour with extensive cortical involvement.
The patient went on to have craniotomy and excision which confirmed the diagnosis of an anaplastic oligoastrocytoma (oligodendroglial predominant).
NOTE: This case predates the 2016 WHO classification of CNS tumour revision. As no 1p19q co-deletion status is available a formal diagnosis cannot be reached and the NOS is therefore used (not otherwise specified) - which is recognised in the current classification for cases where molecular information is unavailable. It should also be noted, that under the new classification both an astrocytic and oligodendroglial component needs to be identified, each with its own molecular markers. True oligoastrocytomas are therefore going to be rare, and this case would most likely be classified as either an astrocytoma or an oligodendroglioma.