Purpose: To describe our experience using barium studies and computed tomography (CT) to diagnose midgut malrotation in an adult. Methods: Barium studies and CT were used to diagnose midgut malrotation in a 60-year-old man who had intermittent chronic abdominal pain for several months. Results: Abdominal CT without contrast indicated complete malrotation of the bowel. Results of the barium enema showed that the ascending colon and transverse colon had left-sided deviation. The patient was radiologically diagnosed as having malrotation, but he had not yet undergone an operation. He reported only experiencing mild symptoms and wished to receive conservative treatment. Conclusions: Midgut malrotation should be considered in the differential diagnosis in patients presenting with chronic abdominal pain. A physical examination and imaging studies may help the surgeon make an accurate diagnosis.