1989 Volume 29 Issue 5 Pages 433-436
The authors report a case of histologically confirmed cerebral arteriovenous malformation (AVM) in which cerebral angiography demonstrated only mass effect. Magnetic resonance (MR) imaging yielded valuable preoperative diagnostic information. T1 and T2-weighted MR imaging demonstrated an area of mixed signal intensity with a mossy appearance, evidence of a hematoma around the mass, and spots of zero signal intensity within the mass, suggesting the presence of vessels with accelerated blood flow.