There is a difference between pulmonary fibrosis foci and nodules. Although both belong to scar tissue that appears after the lung has been damaged, fibrosis is less malignant and is more predominant in CT, which shows clear borders and the appearance of scarring. The causes of nodules are mostly seen in inflammation, tuberculosis, tumors, and fungi can cause. The size, extent, and location of the nodules have an impact on the lungs. Enlarged pulmonary nodules that are growing too fast as well as too large in diameter through regular chest CT examinations require puncture to determine their nature. If it is an early form of malignant tumor, it should be removed by surgery as soon as possible to cure the lung cancer at an early stage. Fibrous foci and nodules need to be examined clinically for prevention.