Most microinfiltrating lung cancers can be cured after surgery. Regular follow-up and review after surgery is recommended, while a small percentage of patients will have recurrence and metastasis. Microinvasive adenocarcinoma is a small, limited type of adenocarcinoma ≤3 cm in size, in which the cancer cells grow mainly in an adnexal manner and the maximum diameter of interstitial infiltration in any field of view is ≤5 mm. Very few cases are mucinous microinfiltrating adenocarcinomas, which exhibit the biological behavior of malignant tumors. The infiltrative component of microinvasive adenocarcinoma is judged by the presence of types other than adnexal growth, such as follicular, papillary, micropapillary or solid types; cancer cells infiltrate the myofibroblastic mesenchyme, and microinvasive adenocarcinoma cannot be diagnosed if the tumor invades lymphatic vessels, blood vessels or pleura or if tumor necrosis is present.