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Japanese

A Case Report of Bizarre Leiomyoblastoma of the Stomach M. Kozakai 1 , K. Yasuda 1 , Y. Yamaguchi 2 , S. Iwakura 2 , T. Shimada 3 , A. Yamaguchi 4 12nd Dept. of Pathology, Teikyo University School of Medicine 22nd Dept. of Surgery, Nihon University School of Medicine 3Shimurabashi Hospital 4Yamaguchi Hospital pp.1339-1344
Published Date 1977/10/25
DOI https://doi.org/10.11477/mf.1403112521
  • Abstract
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 A case of the so-called bizarre leiomyoblastoma (Stout, 1962) of the stomach is presented. The patient was a 26 years old Japanese male, who revealed endoscopically and roentogenoscopically a large tumor in his stomach. The tumor was removed by 2/3 subtotal gastrectomy with Billroth Ⅱ, antecolica. Macroscopically there was a 2.5×2.0×2.0 cm tumor in the submucosa of the lesser curvature in the anterior wall of corpus, with a shallow ulcer in the center of the tumor. Microscopically, the tumor showed round or polygonal cells, having bizarre nuclei with abundant chromatin, and some characteristic perinuclear elear zone in the cytoplasm, intermingled with spindleshaped cells simulating smooth muscle cells. The tumor cells were at places arranged closely related to the vascular wall, and few mitosis could be encountered even when examined strictly. Electronmicroscopically, there were many mitochondria, well developed rEr. and several small dense bodies in their cytoplasm. Of the most interesting features encountered were abundant bundles of myofilament in the perinuclear cytoplasm,100 to 150 A. in width, and having prominent fine tubular structures and especially some remnants of periodic banded profils in the sarcoplasm, closely bound to the adjacent cells partially with desmosomes.

 From these observations described especially by electron microscopy we assume that this tumor, the socalled bizarre leiomyoblastoma, should more appropriately be designated as “bizarre myoblastoma of the stomach”, because of the fine myofilament including striated muscle-like bundles.


Copyright © 1977, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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