Subependymoma of the Lateral Ventricle

—Report of Two Cases—

Abstract

Two cases of huge subependymoma of the lateral ventricle are described. Computed tomographic scans showed that the tumors occupied the entire intraventricular space; however, both were easily removed via the transcortical approach. Histological examination revealed that one tumor was a pure subependymoma and the other was a mixture of subependymoma and cellular ependymoma. The cytogenesis of subependymoma, with emphasis on the subependymal cell plate, is discussed.