Lymph node tuberculosis can be diagnosed by ultrasound, which is the preferred method of examination of superficial lymph nodes and can clearly show lymph nodes and tissue lesions up to 3 mm in diameter.Ultrasound is able to infer the pathological nature of the lymph nodes by analyzing a number of imaging features such as morphology of the lymph nodes, size, border conditions, the presence of fusion of the peripheral membranes, calcification, liquefaction, the ratio of the short to long diameters, the resistance index, and the pulsatility index. The nature of lymph node pathology can be well deduced. Lymph node tuberculosis has several different pathological manifestations, such as granulomatous tissue proliferation, caseous necrosis, fibrosis, calcification, abscesses, and sinus tracts. Different pathologic changes show different images on ultrasound. By analyzing the ultrasound images, it is possible to deduce which pathological changes are occurring in the patient’s lymph nodes. Combined with the patient’s history, clinical manifestations, laboratory tests and pathologic findings, a definitive diagnosis can be made.