Calcified nodules in the lungs are generally not cancerous. Clinically, calcification of lung nodules is mainly due to the following reasons: 1. Such as misfolded tumor, the calcification of misfolded tumor has characteristic, popcorn-like changes; 4, scar cancer: the scar calcification site of old tuberculosis becomes cancerous. Therefore, the vast majority of pulmonary nodal calcifications are benign, but they do need to be observed. If changes occur during follow-up, they should be taken seriously.