Spontaneous hemoperitoneum is rare. The most common etiologies are gynecologic, splenic, and hepatic. Gastric arteriovenous malformations are commonly associated with intraluminal bleeding, but gastric arteriovenous malformations are an unusual cause of spontaneous intraperitoneal hemorrhage. A 54-year-old man presented with acute onset of epigastric pain. The patient was given an operation and pathology confirmed that it was a gastric arteriovenous malformation. (Korean J Gastrointest Endosc 2011;43:5-8)
