Duodeno-duodenal intussusception is often caused by an intraluminal tumour. The condition is rare owing to the retroperitoneal fixation of the duodenum, which is sometime absent in cases of intestinal malrotation. We describe the case of a 19-year old man admitted to hospital with abdominal pain and vomiting. A CT scan revealed a duodeno-duodenal intussusception including the head of the pancreas, which was confirmed by laparotomy. The cause was found to be a duodenal membrane with a pinhole passage combined with non-rotation of the duodenum.