He underwent cerebral angiography on 1/25/93. Upon injection of the RCCA an avascular mass was identified in the right temporal lobe displacing the anterior choroidal artery, and temporal branches of the middle cerebral arteries. The internal cerebral vein is displaced to the left suggesting mass effect. There is a hypoplastic A1 segment and fetal origin of the LPCA. The mass was felt by neuroradiology to represent a hematoma.