This article reports a case of an infrarenal abdominal aortic aneurysm complicated with chronic disseminated intravascular coagulopathy (DIC). The patient was a 68-year-old man; bleeding of 20 months' duration was reported. Physical examination indicated a pulsating mass in the abdomen. The diagnosis of DIC was made on the basis of standard coagulation studies. Indium 111-labeled platelet scintigraphy demonstrated an increased accumulation of radioactivity over the aneurysm. After preoperative control of the bleeding tendency was obtained by continuous intravenous infusion of gabexate mesilate (FOY), the aneurysm was successfully replaced with a prosthetic graft. Gabexate mesilate therapy is useful for DIC as is heparin therapy. If surgical intervention is required for an abdominal aortic aneurysm with concomitant DIC, preoperative control of bleeding with gabexate mesilate or heparin is recommended to lessen operative bleeding.