在临床病理工作中肿瘤的诊断问题是最多见的。实践表明,单靠光学显微镜观察肿瘤组织,有时难以作出“三定”(指定性—良、恶性;定类—组织类型;定分化—分化程度)的诊断。近二十多年来,应用光镜和电镜对手术切除的肿瘤标本进行了大量的综合性研究证实,肿瘤细胞一般都具有来源组织细胞的超微结构特征。不同组织来源的肿 The diagnosis of tumors in clinical pathology is the most common. Practice shows that it is sometimes difficult to make a diagnosis of “three definite” (designated - benign, malignant; definite - type of tissue; differentiated - differentiated) by observing the tumor tissue with an optical microscope. In the past 20 years, a large number of comprehensive studies have been performed on the surgically removed tumor specimens using light microscopy and electron microscopy. The tumor cells generally have the ultrastructure characteristics of the source tissue cells. Swollen from different sources