Vascular lesions protruding into the lumen of the ventricles, either from the roof or from the structures of the floor, are infrequently mentioned in the literature. Bassett 1 reported a patient (Case 5) who appeared to have had an intraventricular vascular anomaly arising from the corpus callosum and draining through the internal veins to the great vein of Galen. No air study was performed and ligation of the anterior artery distal to the anterior communicating artery was the method of treatment employed; no neurological sequelae were noted. Scott, Simril and Seaman 5 described a patient (Case 18) with an arteriovenous malformation in the left hemisphere extending into the left lateral ventricle, fed by the supracallosal artery, and draining into the vein of Galen. The patient died of cerebral edema and thrombosis after surgical extirpation. The following case is of interest in that an arteriovenous malformation arising from the head of the eaudate nucleus and protruding into the left lateral ventricle was successfully removed by a trausventricular approach.