肺门淋巴结环形钙化(简称肺环钙),多见于粉尘中游离二氧化矽含量高的矽尘作业工人。我们从1973～1974年普查21,900名井下接尘作业工人中,发现煤矽肺并发肺环钙者6例,现报道如下: 诊断依据:以国际尘肺X线分类中所列举的肺 Hilar lymph node calcification (referred to as pulmonary ring calcium), more common in silica dust in the high free silica content workers. We surveyed 21,900 workers in the dust-sucking operation from 21,900 people in 1973-1974. We found 6 patients with coal-silicosis complicated with pulmonary ring-calcification and are reported as follows: Basis for diagnosis: According to the lungs listed in the international pneumoconiosis classification,