Cerebral venous angiomas: MR imaging.

Seven patients with angiographically proved cerebral venous angiomas were imaged by magnetic resonance. The venous angioma was identified in all cases. The most characteristic feature was an enlarged transcerebral draining vein (86%), followed by increased signal on T2-weighted images (57%) and decreased signal on T1-weighted images (40%) in adjacent parenchyma. Mass effect was absent in all cases. T2 imaging was more successful in showing the lesions than was T1 imaging.