Abstract
A 69-year-old man was referred to our hospital complaining of abdominal pain in the right lower quadrant. An about 3-cm tumor at the distal portion of the ileum detected by computed tomography scan showed an elevated standard uptake value (SUV) of 18F-fluorodeoxyglucose by positron emission tomography scan. The presence of malignant tumor in the ileum was suspected and the patient was operated on. At surgery, we found a Meckel's diverticulum in the ileum about 40 cm proximal to the ileum end and palpated an elastic-hard tumor in the diverticulum. He underwent segmental resection of the ileum along with the Meckel's diverticulum. The elastic hard tumor found in the diverticulum was diagnosed as adenocarcinoma localized in the submucosal layer histologically. Although this carcinoma was surrounded by both ectopic gastric and pancreatic tissue, it was concluded pathologically to arise from the ectopic gastric mucosa because of its histological continuity and identical immunohistochemical staining pattern with the ectopic gastric mucosa. Since carcinoma in a Meckel's diverticulum has rarely been demonstrated to arise from the ectopic gastric mucosa in the diverticulum by histopathological studies, this case is presented with a review of the literature.
