There is a fundamental difference between intrapulmonary lymph nodes and pulmonary nodules; intrapulmonary lymph nodes are normal tissue, while pulmonary nodules are lesions. Intrapulmonary lymph nodes are arranged along the branches of the bronchial tubes and pulmonary arteries, organizing the lymphatic vessels in the lungs, and their output tubes are injected into the bronchopulmonary hilar lymph node groups. Lymph nodes the body’s immune organs, is a normal structure within the lungs, under normal circumstances from the imaging examination generally can not see the intra-pulmonary lymph nodes, tuberculosis, pulmonary nodal disease, lung cancer, lymphoma and other diseases can lead to intra-pulmonary lymph node enlargement. Lung nodules are lung lesions less than 3 cm in diameter that appear as round-like lesions in the lungs on CT and are usually found during physical examination. They are mainly due to inflammation, tuberculosis or fungal infection. They are mostly benign lesions, such as benign granulomas and infections, but also include malignant diseases such as primary lung cancer and metastatic tumors. Lymph node enlargement and pulmonary nodules can have symptoms such as fever and chest pain, and may not be distinguishable only from the imaging, and need to be read by a professional physician to determine the lesions in conjunction with the condition of the disease, and to make the appropriate treatment.