A Case of the Intraabdominal Hemorrhage due to Segmental Arterial Mediolysis（SAM）．

Abstract

A 65-year-old woman admitted for lower abdominal pain and hypotension. A ruptured abdominal visceral aneurysm with intraabdominal hemorrhage was shown on abdominal computed tomography（CT）． Wide-ranging irregularity in vascular diameter and aneurysm was shown on angiography, suggesting a rupture of an aneurysm of the cecal-colic artery. Hemostasis was achieved by transcatheter arterial embolization（TAE）with microcoils. These findings are attributed to segmental arterial mediolysis（SAM）in this case. The multiple untreated aneurysm and narrowing had almost disappeared on CT 1 year and 10 after the TAE. The natural history of a relatively rare SAM treated by TAE was interesting and valuable in this case.