Monarch Disease Ontology id MONDO_0016702 (oligoastrocytoma) is a WHO grade II tumor composed of a conspicuous mixture of two distinct neoplastic cell types morphologically resembling the tumor cells in oligodendroglioma and diffuse astrocytoma. (WHO). Also known as: MOA, WHO grade II mixed glioma, glioma, mixed, benign, mixed astrocytic-oligodendroglial neoplasm, mixed astrocytic-oligodendroglial tumor, mixed astrocytic-oligodendroglial tumour, mixed astrocytoma-oligodendroglioma, mixed oligo-astrocytoma.