A unique cause of chronic abdominal pain.

The images presented here demonstrated how we arrived at the diagnosis of Ascaris lumbricoides infection in a 54-year-old man with chronic abdominal pain by capsule endoscopy (CE). In this case, computed tomography (CT) images were not representative, and further investigation with CE was required to confirm the diagnosis. The combination of CT and CE was useful for diagnosing Ascaris lumbricoides infection in this patient.