diencephalic astrocytomas (MONDO_0003169, a Monarch Disease Ontology id) is a astrocytoma that involves the diencephalon. Also known as: astrocytoma (excluding glioblastoma) of diencephalon, astrocytoma of diencephalon, astrocytoma of the diencephalon, diencephalic astrocytoma, diencephalon astrocytoma, diencephalon astrocytoma (excluding glioblastoma).