A burr in a lung nodule depends on the length of the burr. Generally, if it is a long burr it is often due to tuberculosis, and if it is a short burr it means that it may be a case of lung cancer, but of course the exact nature of the disease can only be clarified after a puncture or biopsy of the nodule, or radical surgery to confirm the diagnosis. If the pathology finds cancer cells, the diagnosis is confirmed to be due to lung cancer, and if caseous necrosis or antacid bacilli are found, it means a case of tuberculosis. Lung nodules also depend on the size of the nodules. If the nodules are within 5mm, they can be observed, and nodules above 5mm need to be followed up dynamically, and the lung CT will be reviewed after 3-6 months to see the growth of the tumor or nodule, and if the growth is more rapid, further surgical intervention is needed to remove it.