Pulmonary occupational lesions are mainly new growths in the lungs that are detected by imaging, and are called occupational lesions. Most of the lesions are benign, such as inflammatory pseudotumors, tuberculosis caused by Mycobacterium tuberculosis infection, or fibrotic or calcified lesions that remain after the tuberculosis has been cured. It also includes some other bacteria, such as Staphylococcus aureus and Klebsiella, that cause lung infections, and after the inflammation subsides, there are also occupying lesions that are fibrosis of the lungs. Some of the rarer ones are malignant tumors, such as bronchial lung cancer and alveolar cancer, which appear to have cancerous masses.