LEIOMYOBLASTOMA OF THE STOMACH REPORT OF AN UNUSUAL CASE

Abstract

An unusual case of leiomyoblastoma of the stomach in a 70-year-old male is reported. He was admitted to hospital with a complaint of anemia. Gastric X-ray examinations revealed a large diverticulum on the anterior wall in the mid-body of the stomach. Gastroscopically, a deep ulceration like a diverticulum was found at the same site and it seemedto be a source of bleeding. Partial gastrectomy with gastroduodenostomy was performed. The resected specimen showed an extraluminal tumor, 7. 5x8 . 0x6. 5cm in size, on the anterior wall of the mid-body of the stomach. The tumor was cystic like a cavern and the inside of the tumor was necrotic, having no epithelium. Microscopically, the tumor consisted of round, oval or polygonal cells with hyperchromatic nuclei and perinuclear clear zone in the cytoplasm, intermingled with spindle-shaped cells in close-packed arrangement commonly seen in leiomyoma. Mitosis was scarcely seen. From these findings, this lesion was diagnosed as bizarre leiomyoblastoma. Sixty-two cases of leiomyoblastoma of the stomach in Japan were collected and reviewed. Leiomyoblastoma of the stomach with cystic degeneration like a complete cavern has not been reported previously.