Both CT and MRI illustrate features of a low-grade glioma tumour in the right precentral frontal lobe.
Oligoastrocytomas are infiltrating gliomas composed of a mixture of two distinct neoplastic cell types resembling the tumour cells in oligodendroglioma and astrocytoma. They are a WHO grade II tumours and preferentially develop in adults between 35-45 years of age.
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.