A 38-mm tumor in the lung, whether benign or malignant, is relatively large. For malignant tumors in the lung, TNM staging of lung cancer is performed based on the size of the tumor, T, regional lymph node metastasis, N, and distant metastasis, M. A tumor of 38 mm in the lung is in stage T2a, i.e., the maximum diameter of the tumor is >30-50 mm, based on size alone, but it also needs to satisfy that the invasion of the main bronchus has not invaded to the rhabdomyolysis. From the size of the tumor alone, it is impossible to accurately describe the severity of the tumor. If combined with 1~2 ipsilateral regional lymph node metastasis without distant metastasis, the tumor stage of lung 38mm is probably in stage IB~IIIA, which belongs to the early and middle stage lung cancer, and some of them may not be able to undergo radical surgical treatment, and the tumor is relatively large. For benign lung tumors, such as pulmonary fibroma, when the diameter is 38mm, it will also have some pressure on local lung tissues or bronchial tubes, and may stimulate the bronchial tubes, causing symptoms such as coughing and dyspnea, and the diameter is also relatively large. For lung tumors reaching 38mm, it is recommended to seek medical treatment in time and standardize the treatment under the guidance of professional doctors.