Abstract
A 37-year-old man visited our hospital because of nausea, vomiting, and epigastric discomfort. A giant mass was pointed out in the lower abdomen on abdominal CT. Gastroscopy and colonoscopy revealed no lesions. Abdominal US, CT, MRI and angiography revealed a hypovascular giant solid mass of approximately 16cm in diameter in the lower abdomen. Laparotomy was performed with a suspicion of tumor originating from the mesentery. Operative findings showed a white solid tumor, measuring 16.5×９×９cm in the mesentery of the terminal ileum with adhesion to the ascending colon. The tumor also involved other parts of the small intestine. The resected tumor had smooth surface with elastic hard consistency. Histopathological and immunohistochemical diagnosis was mesenteric fibromatosis. The tumor was considered to have originated from the mesentery of the terminal ileum. To our knowledge, only a few cases have been reported as mesenteric fibromatosis without concomitant familial adenomatous polyposis (FAP) or history of open surgery.
