Definition: Rare, slow-growing, benign intraventricular tumors, often asymptomatic and discovered incidentally. The tumors are classified histologically as ependymomas and demonstrate a proliferation of subependymal fibrillary astrocytes among the ependymal tumor cells. (From Clin Neurol Neurosurg 1997 Feb;99(1):17-22)
coord IM with precoord brain/neopl term (IM) + site (IM); do not confuse with ASTROCYTOMA, SUBEPENDYMAL GIANT CELL see ASTROCYTOMA