Leiomyoma of the Lesser Omentum -A Case Report-

Yoshihiro Sato, Susumu Ohwada, Yasuo Morishita

The Second Department of Surgery, Gunma University School of Medicine

Leiomyoma of the lesser omentum is rare. There are only fourteen reported leiomyoma in the lesser omentum that was primary or metastasis from the uterus. A 52-year-old woman was admitted to our hospital because of nausea and abdominal pain. Barium radiograph and endoscopic examination of the stomach revealed an elevated lesion on the lesser curvature of the gastric body. CT scan with contrast medium demonstrated a fist-sized tumor with mosaic pattern. The border between the tumor and the stomach wall was not demarcated. Angiography showed a hypervascular tumor which was fed by a branch of the left gastric artery. Preoperative diagnosis was leiomyosarcoma of the stomach. Subtotal gastrectomy associated with the tumor of the lesser omentum was carried out. Macroscopically, the tumor was covered with the capsule, which showed only fibrotic adhesion without continuence to the stomach wall. Microscopically, the tumor was characterizedby interlacing fascicles of spindle cells. The cell density of the tumor was increased. The tumor was diagnosed as a cellular leiomyoma. It was difficult to differentiate whether leiomyoma of the lesser omentum was primary or metastasis from the uterus, because our patient had myoma of the uterus.

Key words
lesser omentum, leiomyoma, cellular leiomyoma

Reprint requests
Yoshihiro Sato The Second Department of Surgery, Gunma University School of Medicine
3-39-15 Shouwa-machi, Maebashi, 371 JAPAN

Accepted
January 11, 1995

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