A Case of Solitary Fibrous Tumor arisen from the Mesentery of the Transverse Colon

Kiyoshi Kamada, Kazutaka Matumura, Tadashi Nakagawa and Takahiro Akahori

Department of Surgery, Hirao Hospital

A-42-year old man admitted for abdominal pain was found in ultrasonography to have a 70 mm tumor in the left upper abdomen. Computed tomography (CT) showed a heterogeneous-defined tumor. Magnetic resonance imaging (MRI) showed the tumor adhering to the small intestine. Jejunography showed a deformity due to tumor compression. Laparotomy conducted based on a diagnosis of gastrointestinal stromal tumor (GIST) arising from the small intestine showed a tumor arising from the mesentery of the transverse colon and no invasion to other organs. The resected specimen was encapsulated 60×90×50 mm elastic hard tumor whose grayish-white cut surface had a whorled pattern with a focal cyst. Histologically, the tumor consisted of storiform-pattern spindle cells surrounded by abundant patternless collagen. Immunohistochemically, the tumor cells were positive for CD34 and negative for S100 protein, α-smooth muscle actin, and c-kit protein. Based on theses findings, the patient was diagnosed with a solitary fibrous tumor of the transverse colon mesentery.

Key words
solitary fibrous tumor, mesenteric tumor

Reprint requests
Kiyoshi Kamada Department of Surgery, Hoshigaoka Koseinenkin Hospital
4-8-1 Hoshigaoka, Hirakata, 573-8511 JAPAN

Accepted
November 18, 2009

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