An Ultrastructural Study on Two Cases of Canine Leiomyosarcoma

개의 평골근육종(平滑筋肉腫) 2예(例)에 관한 미세형태학적관찰(微細形態學的觀察)

Undifferentiated leiomyosarcomas were encountered in two dogs, and an ultrastructural study was carried out. The results of this study were summarized as follows; 1. The nuclei of mosts tumor cells showed bilobate appearance. 2. Most cells of the tumors had not a distinct basement membrane. 3. Most cells of the tumors had a degenerative rough endoplasmic reticulum. 4. Intercellular matrix contained some amounts of collagen. 5. Attachment areas between tumor cells were not apparent, but a few tight junction were clearly seen. 6. Myofibrils were present in bipolor end area.