title: Gastrointestinal bleeding due to an invaginated and intussuscepted Meckel's diverticulum diagnosed by intraoperative ileoscopy.
mesh_terms: D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D007082:Ileum; D007443:Intussusception / Q000150:complications* / Q000175:diagnosis; D008297:Male; D008467:Meckel Diverticulum / Q000150:complications* / Q000175:diagnosis; D008875:Middle Aged