Duodenal duplication cyst: a rare cause of geriatric gastrointestinal bleeding.

Duodenal duplication cysts are rare congenital anomalies usually found in children, but rare cases, often presenting with pancreatitis, have been reported in adults. We report the case of a duodenal duplication cyst in an 81-year-old man who presented with gastrointestinal bleeding. Despite endoscopy and endoscopic ultrasonography, duodenal duplication was not diagnosed until exploratory laparotomy was performed to remove the lesion. To the best of our knowledge, this was the first case of a duodenal duplication cyst that presented with gastrointestinal bleeding in an elderly adult. The patient's recovery was uneventful. A high index of suspicion is required to diagnose duodenal duplication cysts, particularly in elderly patients with an atypical presentation.