So a single look at the enlarged lymph nodes does not immediately clarify exactly what the problem is. Further blood tests for infectious markers, such as routine blood, CRP, and tumor markers, are needed; also ask if there is fever, chills, cough, or even localized redness and pain, which are common symptoms of infection;
A further high-resolution CT should also be done to more clearly define the specific manifestations of the enlarged lymph nodes and whether there are any other abnormal signs in the lungs.
We also need to do further high-resolution CT to clarify the specific manifestations of the enlarged lymph nodes and whether there are other abnormal signs in the lungs, to provide more evidence to clarify what the disease is. If no change is seen then a tracheoscopic biopsy can be considered to send pathology to clarify the cause.