Gastroduodenal Artery Pseudoaneurysm, A Rare Cause of Gastrointestinal Bleeding Complicating Pancreatitis.

Gastroduodenal artery pseudoaneurysm is an uncommon but life-threatening complication of acute pancreatitis (AP). We present a 58-year-old man with presumed mild AP who developed massive intra-abdominal hemorrhage due to a gastroduodenal artery pseudoaneurysm. The patient's initial imaging suggested a pancreatic pseudocyst, but an atypical presentation for AP prompted a computed tomography angiogram that identified an actively bleeding pseudoaneurysm. He underwent urgent coil embolization with successful hemorrhage control. This case highlights the importance of early recognition and multidisciplinary management of visceral artery pseudoaneurysms in pancreatitis to prevent potentially catastrophic outcomes.