Cerebral venous angiomas: clinical evaluation and possible etiology.

The authors report 6 cases of cerebral venous angioma and compare the angiographic findings, clinical symptoms, electroencephalographic foci, and histological features to those in 26 previously reported cases. They conclude that the so-called venous angioma has little clinical significance, that neither arteries nor capillaries are involved in this type of vascular malformation, and that the small, dilated veins which develop secondarily are due to an abnormality in venous development during embryogenesis.