A Case of Sciatic Arterio-venous Malformation

Abstract

A persistent sciatic artery is a rare congenital anomaly. On the other hand, a persistent sciatic vein is frequently associated with Klippel–Trenaunay syndrome. However, co-existence of both conditions is extremely rare. An 84-year-old woman was referred to our department for swelling of the unilateral lower extremity. Her internal iliac artery angiogram revealed persistence of both sciatic artery and dilated meandered sciatic vein. Furthermore, the sciatic artery connected with the dilated meandered sciatic vein directly through ‘nidus’ without a capillary connection. This is the first case of sciatic arterio-venous malformation.