A Case of Adenocarcinoma of Meckel's Diverticulum arising from Ectopic Gastric Mucosa

Abstract

Adenocarcinoma of Meckel's diverticulum is rare, with only 36 cases reported to our knowledge in Japan. A 43-year-old man seen for lower right pain and diagnosed from computed tomography (CT) with a malignant ileal tumor was found in surgery to have a 48 mm tumor at the apex of Meckel's diverticulum 120 cm from the ileocecal valve. The tumor had invaded the abdominal wall adjoining the right side of the bladder, presenting with dissemination, paraaortic lymph node swelling, and liver metastasis. The diverticulum and tumor were resected. Pathologically, the tumor was well-differentiated adenocarcinoma developing from Meckel's diverticulum containing ectopic gastric mucosa that may have given raise to the tumor.