Lung microinvasive adenocarcinoma refers to a pathological subtype of lung adenocarcinoma, and microinvasiveness represents the depth of infiltration of lung adenocarcinoma cells into the deeper layers. If the cancer cells of lung adenocarcinoma are confined to the glandular epithelial layer without deep infiltration, it is called adenocarcinoma in situ and belongs to the earliest stage of lung adenocarcinoma. If the cancer cells of lung adenocarcinoma have undergone deep infiltration, but the degree of infiltration is small and the number of infiltrating cells is limited, it is called lung minimally invasive adenocarcinoma, which belongs to the very early stage of invasive lung adenocarcinoma. The main treatment for adenocarcinoma in situ or minimally invasive adenocarcinoma of the lung is surgical resection. Once adenocarcinoma of the lung is detected, it should be treated as early as possible if it is in the stage of surgical resectability to prevent disease progression and to improve prognosis.