On the basis of anatomy, the human lung is divided into three parts: the tip of the lung is located 2-3 cm above the medial segment of the clavicle, and the base of the lung is located on the midline of the clavicle where it intersects with the sixth rib, and the tip of the tip of the lung will protrude from the upper edge of the clavicle. Possible lesions of the pulmonary apex include tuberculosis and lung cancer. The pulmonary apex is a good site for tuberculosis due to poor blood flow, and primary bronchopulmonary carcinoma in the pulmonary apex is clinically rare and accounts for a relatively small number of the many types of lung cancer. Since the apical lung often grows toward the clavicle and outside the thorax, the lesion of the apical lung may also invade other organs such as brachial plexus nerve and sympathetic nerve and cause various complications, so clinically, the diagnosis of lung cancer occurring in the apical lung may easily lead to misjudgment and misdiagnosis by patients and doctors.