We found that there were many tonofilaments in the rhbdomyosarcoma like cells observed with light microscope and there were not any myofilaments.A string of desmosomes can be seen between the cells.

• 发现光镜下所见的肿瘤组织内横纹肌肉瘤样细胞，电镜下可见其胞浆内有较多的张力原纤维，未见肌丝，癌细胞间可见成串的桥粒。