Mediastinal lymph node 1.5 shows ring-shaped enhancement, indicating enlarged lymph nodes, which may be caused by acute lymphadenitis or lymphoma. 1. Acute lymphadenitis: it is usually caused by bacterial infection, which leads to localized enlargement of lymph nodes, and fever, headache and other symptoms may appear in the later stage, and anti-infection treatment can be carried out under the guidance of doctors. 2. Lymphoma: Lymphoma is a kind of malignant tumor, if the lymph node enlargement is caused by lymphoma, it needs to improve the symptom in time by radiotherapy and chemotherapy to avoid metastasis in the late stage, which will lead to more serious condition. Normally, you should pay attention to the dietary rules, eat less spicy and stimulating food, do not smoke and do not drink, avoid overwork and do not stay up late. If the mediastinal lymph node 1.5 is ring-shaped enhancement, you need to go to the hospital in time to avoid delaying the condition.