Mesenteric lymph node enlargement of 15mm*5mm is a manifestation of large diameter, whether it is serious or not is mainly to determine the cause of the disease, inflammation or immune system abnormality is not considered serious; tumor lesions caused by a serious condition. 1. At present, the enlarged mesenteric lymph nodes are judged to be benign lesions through clinical history, ultrasonography and laboratory tests, which mainly include infections and immune system disorders, and they are not particularly serious, and can be restored through medication. 2. If the patient has a history of tumor and the lymph nodes are enlarged, and the lymph nodes continue to increase in the process of review, and metastasis is highly suspected, it is a serious condition, which indicates that the tumor has entered into the advanced stage, and radiotherapy is needed to control the tumor. When enlarged mesenteric lymph nodes are found, it is necessary to combine with clinical history, closely follow up, determine the cause of the disease, and carry out standardized treatment under the guidance of clinicians.