A Case of Leiomyoma of the Transeverse Colon.

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A very rare case of transeverse colon leiomyoma was experienced. A 48 year-old female with abdominal pain, lumbago and fever as chief complaints visited our hospital.<BR>Under diagnosis of transeverse colon diverticulitis, she underwent laparotomy. The greater omentum, jejunum, mesentery and gastrocolic ligament adhered to the posterior wall of the mid transeverse colon and built a fist-sized tumor. This tumor was measured 9×7×7cm and grew extramurally from the muscle layer of the transeverse colon. The central part was necrotic and yellow pus accumulated in the cavity, measuring 6×4×4cm.<BR>A fistula, 5mm in diameter, was observed between the central cavity of the tumor and the lumen of the transeverse colon. The cells consisting the tumor showed little atypia or pleomorphism ; the density of nuclei was relatively low and showed little mitosis; and the tumor was diagnosed as leiomyoma.
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