Adenocarcinoma of Meckel's diverticulum diagnosed by capsule endoscopy and single-balloon enteroscopy.

A case of adenocarcinoma arising in Meckel's diverticulum in a 58-year-old man is reported. Abdominal computed tomography and ultrasonography showed a solid tumor in the middle of abdomen. Capsule endoscopy (CE) showed tumorous lesion in the distal ileum. Single-balloon enteroscopy (SBE) subsequently showed the tumor in Meckel's diverticulum. Furthermore, biopsy specimen obtained from the lesion revealed it as adenocarcinoma. At laparotomy, we found the tumor at the blind end of the diverticulum and enlarged lymph node about 7 cm in diameter in the small intestinal mesentery. Segmental resection of the ileum, including the tumor-bearing diverticulum, was performed along with regional lymph node dissection. Histologically, origin of the tumor was assumed to be ectopic gastric mucosa. Although neoplasm in Meckel's diverticulum is difficult to diagnose preoperatively, the combination of CE and SBE was useful. Based on our search, this is thought to be the first case of neoplasm in Meckel's diverticulum diagnosed endoscopically.