Invasive adenocarcinoma of the lung is the pathological diagnosis of lung cancer and has now become the most common type of lung cancer pathology. Its age of onset is younger than that of squamous and small cell carcinoma, but the absolute number of incidence is still higher in men than in women in our country. Typical pulmonary invasive adenocarcinoma cells are glandular or papillary in shape, with uniform cell size, round or ovoid, rich cytoplasm, often containing mucus, large and darkly stained nuclei, often with nucleoli, and relatively clear nuclear membranes. Invasive adenocarcinoma of the lung can occur at all levels of the bronchi, but small bronchi are the most common, and therefore the peripheral type is the most common. Adenocarcinoma tends to grow extra-tubularly, but can also spread along the cell wall with attached blood vessels, with relatively early local infiltration and hematogenous metastasis.