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JAMA. 1952;150(2):150. doi:10.1001/jama.1952.03680020084016.
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Pulmonary Silicosis.  —Recently, Dr. J. Ansola and his colleagues reviewed 717 cases of pulmonary silicosis. At present, there are 80,000 persons engaged in mining in Chile: 15,000 in copper mines, 20,000 in coal mines, and 30,000 in saltpeter mines. Chile also has quartz, glass, ceramic, and cement industries. In 1941 Lorca and his colleagues proposed to the Chilean Society of Tuberculosis a new classification of silicosis. Lorca based his classification on the distribution of nodular elements on the lung fields rather than on the diameter of the nodular element. He divided his cases into the following groups. 1. Habitual fibrosis or normal thorax. 2. Initial pathological fibrosis, in which there is an accentuation of the bronchovascular pattern and of the hila. In this phase the characteristic nodular element is still not to be found. 3. (first phase) Initial nodular fibrosis, in which the nodular lesion is seen. 4. (second phase)


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