Lung nodules are classified into 3 conditions: ground glass nodules, partially solid nodules, and solid nodules, while the appropriate treatment will be taken according to the nodule size. If the nodule is less than 5mm, 1 yearly follow-up with high resolution CT of the chest is recommended; if the nodule is between 0.6-0.8cm, follow-up once in about 3 months is recommended; if the nodule is larger than 0.8cm and partially solid nodule is considered, we should be highly alert to whether it is an early in situ tumor of the lung, and 1 month follow-up and early surgical intervention by a thoracic surgeon is recommended. Therefore, a small nodule of 5mm in the upper lobe of the right lung belongs to the 1-year follow-up category. If there is a history of tuberculosis in the past, such a nodule is most likely to be an old tuberculosis nodule, and it is necessary to distinguish which of the 3 conditions it belongs to before deciding whether it needs percutaneous pulmonary puncture or early interventional treatment by thoracic surgery.