Abstract
An 81-year-old woman on anticoagulant therapy after mechanical heart valve replacement was admitted because of acute aortic dissection. Anticoagulant therapy had to be continued with heparin even after admission. Gastrointestinal hemorrhage occurred suddenly and she developed hemorrhagic shock. Computed tomography findings suggested that the bleeding was due to rupture of a pseudoaneurysm of the pancreaticoduodenal arcade. After the site of bleeding was identified by angiography, hemorrhage was successfully controlled by embolization with coils. With the aging of the population, vascular complications of arteriosclerosis are likely to increase. This case report provides important insights that could be helpful for treating such patients.