Abstract
A 70-year-old man was admitted urgently to our hospital because of shock from massive hemorrhage via the anus. Laboratory studies on admission showed severe anemia. Emergency endoscopic examination showed a submucosal tumor like elevation in the duodenum without over bleeding. We suspected bleeding from the duodenum due to ruptured aneurysm of gastroduodenal artery by 99mTc-HSA, CT scan and EUS, and confirmed it by angiography. After then, the patient was gotten hemorrhagic shock again and underwent an emergent operation. His postoperative course has been uneventful.