CT of the lungs determines inflammation and cancer, usually in the direction of shape and density. However, CT is not the gold standard for cancer diagnosis. 1. Shape, if it is inflammation, localized flocculent or patchy shadow can be seen under CT, and bronchial insufflation can be seen in the lesion area. It will not be accompanied by other parts of the narrowing, such as the trachea and other parts. Cancer, on the other hand, will show irregular, fuzzy shadows with burr-like changes. And usually infiltrative growth, compression of the surrounding tissue, so there will be local narrowing. 2. Density, the density of inflammation is generally uniform, while the density of cancer is uneven. If it is difficult to judge, you can use antibiotic treatment for a period of time after review, if the shadow decreases or subsides, it means inflammation, if the shadow does not decrease but increases, then consider the possibility of cancer. In general, the gold standard for diagnosing cancer is pathologic testing. If there is any discomfort, please seek medical advice immediately.