[Hemosuccus pancreaticus caused by a ruptured splenic artery aneurysm in an intraductal papillary mucinous neoplasm].

An octogenarian male patient who had experienced 2 bleeding episodes in 1 year was hospitalized for melena. During the examination for the obscure gastrointestinal bleeding, a mixed-type intraductal papillary mucinous neoplasm (IPMN) was found, and an endoscopic ultrasound examination revealed a 4-mm splenic artery aneurysm protruding from the same lesion in the pancreatic tail. Distal pancreatectomy was performed, and the pathological diagnosis revealed ruptured blood vessels and blood components within the IPMN. The patient was diagnosed with hemosuccus pancreaticus due to a ruptured splenic artery aneurysm. We report this rare case of a splenic artery aneurysm triggered by IPMN.