Not all pulmonary burrs are malignant. Inflammation of the lung and pleura can also lead to the development of burrs. The nature of the burr needs to be determined by CT imaging, patient’s symptoms, hematology, and lung puncture biopsy to diagnose whether the patient is a malignant tumor. CT of the chest shows burrs, which emanate from the lesion like short linear shadows extending from the lung parenchyma, without adhesions to the pleura. Generally, greater than 5 cm is called long burr, less than 5 mm is short burr, and short burr below 5 mm is more likely to be malignant.