Supratentorial Arteriovenous Malformations of the Brain

摘要: Arteriovenous malformation (AVM) is a congenital, abnormal communication between arterial and venous channels without the interposition of capillary system. This term comprehends two types anomalies: 1. Arteriovenous fistula, which simple direct an normal vessel. lesion can also be traumatic, commonly observed at dural or extradural sites. 2. Arteriovenous angioma when territory mediated by several anomalous convoluted vessels that represent lesion. most frequent type cerebral In some cases distinction forms difficult impossible angiography, as arteriovenous with tiny scanty multiple connections may simulate direct, fistulous shunt.