A lesion is usually a tumor, but it can also be other inflammatory lesions. The lesions are found by imaging, and the specific nature of the lesions must be judged by pathological examination. If there is a lesion in the lung, it may be considered to be caused by a lung tumor, including benign lung tumor and malignant lung tumor, which requires bronchoscopy for pathology or percutaneous lung puncture biopsy for pathology to be able to determine the nature. The lesion also depends on whether there are metastatic lymph nodes around the lesion, like malignant lesions, there is a possibility of metastasis around the lesion, extensive metastasis is no way to perform surgery, only to do palliative radiotherapy, chemotherapy, etc. to control the development of the disease. If the lesion is confined in situ, it is called carcinoma in situ, and the pathology can confirm the diagnosis after surgery, and the radical effect of surgery is very good.