Oligoastrocytoma
Oligoastrocytomas are tumours with mixed oligodendroglioma and astrocytoma cell populations. They are common, accounting for 50% of all oligodendrogliomas. On imaging they have apearances that are essentially indistiguishable from their constituent tumours, carry a prognosis equivalent to their astrocytoma component. (worse grade for grade).
Oligoastrocytomas are WHO Grade II and anaplastic oligodendrogliomas are WHO Grade III
