目前,许多学者倾向于把横纹肌肉瘤分为多形性与胚胎性两大类。后者包括实性(弥漫)型,腺泡型和葡萄簇肉瘤型三个亚型(4,5,13～15)。作者对胚胎性横纹肌肉瘤的三个亚型进行了光学和电子显微镜[以下简称 LM 和 EM]对比观察,试图从超微结构水平上探索肿瘤的形态与横纹肌胚胎发育过程之间的内在联系,并从中总结出有助于诊断的线索。 At present, many scholars tend to divide rhabdomyosarcoma into pleomorphic and embryonic categories. The latter includes three subtypes of solid (diffuse), acinar, and grape cluster sarcoma (4, 5, 13–15). The authors performed optical and electron microscopic observations on the three subtypes of embryonal rhabdomyosarcoma (LM and EM for short), attempting to explore the intrinsic link between the morphology of the tumor and the development of striated muscle embryos at the ultrastructural level. The clues that help diagnose are summarized.