Brief history: Female, 66 years old, admitted to the hospital with “cough for 10 days”. Case characteristics: The patient developed a cough 10 days ago after catching cold, mainly dry cough, occasionally coughing a small amount of yellow mucous sputum, chest pain when the cough was intense, no fever, hemoptysis, night sweats, chest tightness, shortness of breath, precordial discomfort, nausea, vomiting, abdominal pain, diarrhea, urinary frequency, urinary urgency and other discomforts, self-administered cold medicine at home, but the cough did not ease significantly, tumor complete set: high carcinoembryonic antigen 1.92ng/ml neuronal enolase The patient was admitted to our department with “right lung occupancy” after being treated with anti-infection (colistin) and other symptomatic treatments. The patient is in good spirits, normal physical strength, normal appetite, normal sleep, no significant change in weight, normal stool and normal urination. He had no past medical history and no history of drug allergy. Pathological findings: Intraoperative resection of (right lower) part of the lung tissue 7x6x2cm, a grayish-white mass with a diameter of 2cm was seen in the section, with a brittle texture, clear boundaries with the surrounding tissue, slightly lobulated and without envelope. Impression: (right lower lung) misshapen tumor (predominantly cartilaginous component) Discussion: Pulmonary misshapen tumors occur mostly in superficial subpleural lung sites, are spherical and oval in shape, have an intact envelope, are hard, and are easily separated from surrounding lung tissue. Pulmonary malformation tumors are 0.5 to 12 cm in diameter, mostly less than 3 cm. The tumors are grayish-white, hard, with mucus and cystic cavity. The main components are cartilage, glands, smooth muscle, fat and fibrous tissue. The tumor can be calcified, mostly located in the center and distributed more evenly. Such calcified structures often resemble popcorn-like or walnut-like.