[A Case of Giant Intra-Abdominal Desmoid Tumor-A Case Report].

The patient was a 47-year-old woman. She had been aware of abdominal distension for several months and visited our hospital. Contrast CT revealed a 30 cm tumor with uneven contrast effect. MRI showed uniform low signal intensity on T1 weighted images and a mixture of low and high signal intensity on T2 weighted images. She was diagnosed with a giant ovarian tumor and underwent surgery at the gynecology department. Laparotomy revealed that the tumor originated in the small intestine mesentery rather than the ovary, and she was referred to our department during surgery. The tumor had involved the ileocolic artery and vein, and was removed by right hemicolectomy. The specimen was 32×32×27 cm and weighed approximately 8 kg. Histopathological examination showed proliferation of spindle cells. Immunohistochemistry showed negative staining for c-kit and positive staining for β-catenin. The tumor was diagnosed as an intra-abdominal desmoid tumor. Intra-abdominal desmoid is a rare disease, and diagnosis and surgical procedure are often difficult. We report a case of resection of a giant mesenteric desmoid tumor with a review of the literature.