Lymph node shadow in the lungs is a pathological change found through imaging examination of both lungs, including doing X-ray and CT of both lungs, etc. Generally, the most common is inflammation, including acute attack of chronic bronchitis and tuberculosis caused by infection of Mycobacterium tuberculosis, and these inflammations will cause lung lesions in addition to lymph node enlargement and hyperplasia, so there is a shadow of lymph in the lungs. It is also seen in malignant lesions, such as primary lung cancer, where the cancer involves the lymph in the lung and appears as enlarged lymph nodes. In addition, there are malignant tumors outside the lung, such as bone tumors other than lung cancer and stomach cancer, which have metastases in the lung and appear as enlarged lymph nodes.