Heterotopic pancreas is a defined as the case where pancreatic tissue is located outside its normal anatomical location. It is a congenital anomaly and often an incidental finding, and can be found at different sites in the gastrointestinal system. Jejunum is a rare localization for heterotopic pancreas. It is usually asymptomatic. Due to their origin and spread, these lesions form intramural masses with relatively late mucosal invasions and their diagnosis is difficult task through endoscopic technique and radiological imaging. In this case report, we are presenting the case of a 64 year-old male patient, due to its rare localisation and complication, who was taken under an urgent operation due to acute abdomen diagnosis, and who was diagnosed, during the operation, with jejunal heterotopic pancreas which causes segmental mesenteric ischemia.