Lung carcinoma in situ is a kind of early stage cancer, which is categorized into squamous carcinoma in situ and adenocarcinoma in situ. Since it is an early stage cancer without metastatic spread, it is recommended to choose appropriate surgical treatment plan under the guidance of doctors to achieve the goal of early detection and early treatment. Lung carcinoma in situ usually has a lesion no larger than 3 cm, and the tumor cells are confined to the normal alveolar tissue structure, without invasion to the surrounding tissues, and not accompanied by lymph node or distant metastasis. Lung carcinoma in situ belongs to stage 0 lung cancer, which is the early stage of cancer. It is recommended that patients should receive timely surgical treatment after diagnosis to completely remove the early lesions, which usually will not recur after surgery and the surgical treatment is more effective. Meanwhile, since there is no infiltrative growth in lung carcinoma in situ, radiotherapy or chemotherapy can be avoided after surgery. Lung carcinoma in situ belongs to early stage cancer, so it is recommended that patients receive timely surgical treatment under the guidance of doctors after diagnosis.