A case of mesenteric fibromatosis rapidly grown in a short duration is reported. A 70-year-old man was found to have a tumorous lesion about 11cm in maximal diameter in front of the left kidney by abdominal CT scan 77 months after a right hepatic lobectomy for hepatocellular carcinoma. We suspected that the tumor was originated from the mesentery of the small intestine with close examination. Upon laparotomy, the tumor was present in the mesentery of the ileum. A resection of the tumor including the ileum, about 60cm in length, was performed. On histopathological and immunohistochemical examinations, the tumor was diag-nosed as mesenteric fibromatosis (MF). No evidence of recurrence of the tumor has been found as of 24 months after the 2nd operation.
This case is a rare of in terms of the delayed occurrence of the tumor after a lapalotomy and rapid growth of the tumor for only 4 months.
Complete resection of the tumor is considered to be the treatment of choice for MF. If a complete resection is not performed, multidisciplinaly treatment including chemotherapy, irradiation therapy, and endocrine therapy should be added. Long-term follow-up would be mandatory because of its high rate of recurrence.