通过对本所历年集体诊断的139例尘肺胸片的复习,其小阴影的形态、密集度及分布具有如下特点:类圆影的出现率为91.37％,不规影8.63％,矽肺与其它尘肺不规影的出现率分别为5.88％和11.27％,无显著的统计学差异;在类圆影中,矽肺的粗大类圆影出现率较高,其它尘肺则以P影的出现率较高;小阴影的直径增大,密集度也随之增加,分布范围也随之广泛。 Through the review of 139 cases of pneumoconiosis chest radiographs collectively diagnosed in previous years, the appearance, density and distribution of the small shadow have the following characteristics: the appearance rate of round shadow is 91.37% and irregularity is 8.63% The incidence of speckle was 5.88% and 11.27% respectively, with no significant statistical difference. In the round-robin, the incidence of gross round-like appearance of silicosis was high, while that of other pneumoconiosis was higher The diameter of the shadow increases, the intensity also increases, the distribution range also will be broad.