Breathing all the time, people if 5 minutes without breathing behavior, it will cause fatal consequences. Ms. Li has been due to respiratory difficulties, nearly killed. 63-year-old Ms. Li retired like to travel with friends, two years ago after an event, Ms. Li accidentally caught a cold, began coughing, they bought some cold medicine to eat, but has not seen a good, but also appeared to suffocate asthma, shortness of breath, coughing up sputum and other symptoms, and the strange thing is that the shortness of breath symptoms associated with the change in body position, it went to the local hospital for a chest CT examination, the examination The results scared Ms. Li, CT showed that Ms. Li’s main trachea with the presence of a mass, in order to further determine the results, Ms. Li received a tracheoscopy, found that there is a new organism in the opening of her left main bronchus. After admission, tracheoscopy was performed under general anesthesia. Through the tracheoscope, a thumb-sized mass was seen attached to the posterior wall of Ms. Li’s trachea, blocking the left main bronchus (figure below). Under the guidance of the tracheoscope, a carbon dioxide freezing probe was sent to the mass in the trachea, so that the mass would stick to the freezing probe, and then gently pulled outward, and the mass tissue slowly came off from the trachea wall, and then taken out together with the tracheoscope, so that three yellow fat-like masses were repeatedly frozen and removed, and a large amount of yellow pus sputum was suctioned out, and only then was Ms. Li’s lumen open, and the base of the tumor was clearly seen. The base of the tumor was located at the opening of the left upper lobe, and the pathology confirmed that it was an endobronchial lipoma (a kind of benign airway tumor). The tumor did not recur after 1.5 years of follow-up. Cryotherapy is ideal for both benign and malignant lesions. It is mainly used for lesions with severe airway obstruction, and can rapidly remove the diseased tissues and make the airway open. Carbon dioxide cryopreservation of a mass A yellow fat-like mass is removed.