Patient: I did five-year retest with papillary thyroid cancer in 2002 without any abnormality; in March this year, I went for retest and found multiple lymph nodes; thyroid function test (thyroxine tablets) was small from one to two; (ultrasound) suggested further examination and then did (ect imaging) did not see metastasis of systemic foci; now my body feels that there is no symptom, and I was retested once in April, and I was told that I would come back after two months. 1, to adenoglobulin 5.05; 0-20ng/ml. 2, thyrotropine [1.37]. 3, Thyrokinin 10.52 six free triiodothyronine [5.27]. 4, Free thyroxine [1.28]. 5. Triiodothyronine [0.71] Blood analysis is not abnormal (biochemical examination of blood lipid is a little less high). Cervical lymph node metastasis is a common mode of metastasis in differentiated thyroid cancer and an important factor affecting the prognosis of thyroid cancer. Cervical lymph node metastasis is mainly seen around the thyroid gland on both sides and in the paratracheoesophageal sulcus, i.e., lymph node metastasis in the central neck area is common. Ultrasonography is highly sensitive in determining the presence or absence of neck metastases from thyroid cancer. Ultrasonographic features suggestive of abnormal metastatic lymph nodes include loss of fat-gated structures, a rounded rather than oval shape (96% specificity for short-axis greater than 5 mm;), hypoechoicity, cystic changes, calcification (small calcified spots are an important diagnostic criterion for metastasis) and peripheral blood flow richness. Peripheral flow richness had a high sensitivity (86%;), all other sensitivities were below 60%;. Lymph nodes with suspicious sonographic features can be further confirmed by ultrasound-guided fine -needle aspiration cytology. The accuracy of cytologic puncture examination can reach 94 to 98%, but the diagnostic sensitivity for primary foci is not yet satisfactory, only 55.88%. When the puncture results cannot be differentiated from lymphadenitis or non-thyroidal tumor metastasis, biomarkers such as thyroglobulin and calcitonin can be detected in the specimen. A thyroglobulin concentration of 1 ng/mL suggests a low likelihood of malignancy. Iodine-131 is one of the effective treatments for lymph node metastasis of DTC, which is based on the premise that the lesion ingests iodine-131. After treatment, most patients experience remission, and some or most of the metastatic lymph node foci disappear, or even all of them disappear. Surgical resection is appropriate for single lymph node metastatic lesions, as well as for single lymph node lesions remaining after multiple iodine-131 treatments.