不规则形小阴影作为胸片上的一种基本X线征象,被应用于尘肺的诊断和分类,始见于1967年的U/C分类,并为1968年以后的历届ILO尘肺国际分类所采纳,成为尘肺小阴影两种基本形态(圆形和不规则形)中的一种。目前,除了已采用ILO国际分类的国家外,一些未正式采用ILO国际分类的国家,如日本、苏联等国,也在它们各自国家的诊断标准中应用了不规则形小阴影这一概念及其符号(s、t、u)来描述和诊断尘肺。但是关于不规则形小阴影在尘肺诊断中是否具 The irregular small shadow, as a basic radiographic sign on a chest radiograph, was applied to the diagnosis and classification of pneumoconiosis, beginning with the U / C classification of 1967 and adopted by the International Classification of ILO pneumoconiosis since 1968 as One of the two basic forms of pneumoconiosis (round and irregular). At present, some countries that have not officially adopted the international classification of ILO, such as Japan and the Soviet Union, have applied the concept of irregularly shaped small shadows to their respective national diagnostic criteria, in addition to countries that have adopted the international classification of ILO Symbol (s, t, u) to describe and diagnose pneumoconiosis. However, irregular small shadow in the diagnosis of pneumoconiosis whether