Purpose:AVMs are congenital vascular anomalies,not proliferative neoplasms,but tend to behave aggressively with unpredictable growth and tissue destruction.For the understanding the Angioarehitecture of extracranial AVM,which is believed the main cause that can explains all present ing symptoms,the study is aimed to elucidate the vascular structure of common AVM with vascular casting of completely excised AVM specimens.