Pulmonary nodule refers to the lump in the patient's lung less than three centimeters. First of all, it is only necessary to distinguish whether lung nodules are benign or malignant. At this time, it is suggested that patients go to the hospital for diagnosis and treatment, do chest ct examination or make a pathological examination through bronchoscope or percutaneous lung puncture to diagnose the nature of pulmonary nodules. Then give patients corresponding treatment by distinguishing benign and malignant degrees.

1. Pulmonary nodules are small foci with circular shadows, with high image density, and can be single or multiple, without atelectasis, hilar enlargement and pleural effusion. Solitary pulmonary nodules have no typical symptoms, usually a single soft tissue shadow with clear boundary, increased density, diameter ≤3cm, and surrounded by air-containing lung tissue. Local lesion diameter >; 3cm is called a lung mass, and the possibility of lung cancer is relatively high, which is beyond this knowledge. It is generally believed that > 10 diffuse nodules are likely to be accompanied by symptoms, which can be caused by metastasis or active infection of malignant tumors outside the chest, and the possibility of primary lung cancer is relatively small.

Second, small pulmonary nodules do not represent early lung cancer. Many lung diseases will form nodules, such as inflammation, tuberculosis, mold, subsegmental atelectasis, bleeding and so on. Therefore, the possible diagnosis of pulmonary nodules can be said to be various, including inflammatory pseudotumor, hamartoma, tuberculoma, fungal infection, sclerosing lung cell tumor and so on. Malignant can be primary lung cancer or metastatic lung cancer. Of course, some benign lesions may become malignant after a long time. According to the statistics of large sample population, more than half of solitary pulmonary nodules with a diameter over 25px( 1cm=25px) are malignant. Such data tells us that we must never underestimate the small pulmonary nodules inadvertently found during physical examination. 80%-90% of the pulmonary nodules found in the initial CT examination are benign lesions, but we should attach great importance to them, because there is still a certain proportion of early lung cancer, and regular examination is essential. Thirdly, pulmonary nodules are some structural changes in the lungs, which can usually be found by low-dose spiral CT. Pulmonary nodules with a diameter less than 30 mm are called masses with a diameter greater than 30 mm. Solitary pulmonary nodules can also be classified according to their size, such as pulmonary nodules with a diameter of ≤ 5 mm; Lung nodules, the size is between 5-65438 00 mm; The diameter of larger pulmonary nodules is between10-30 mm. Usually, low-dose spiral CT is used to complete this examination. Basically, this examination can find nodules below 30 mm. For pulmonary nodules, because they are relatively small, chest X-ray can't be found. In order to make a definite diagnosis as soon as possible, it is suggested to choose low-dose spiral CT.