Microinvasive adenocarcinoma, the full name in English is minimally invasive adenocarcinoma, abbreviated as MIA, is a type of WHO lung adenocarcinoma pathological staging in 2015, which is a pathological manifestation of early stage lung adenocarcinoma. The diagnosis of microinvasive adenocarcinoma requires a gross specimen after pneumonectomy, which corresponds to a CT chest, usually showing a subsolid nodule with both a ground glass component and a solid component, usually less than 3 cm in diameter The solid component is usually less than 5 mm in diameter. Microinvasive adenocarcinoma is a manifestation of early stage lung cancer, and surgical treatment has the potential to achieve clinical cure.