Thyroid dysplasia also refers to undifferentiated carcinoma of the thyroid, which is not transformed from papillary malignancy, and the two are different pathological subtypes. Clinically, malignant tumors of the thyroid gland are classified as papillary, undifferentiated, follicular and medullary carcinomas. The vast majority of patients are papillary and follicular carcinoma of the thyroid. Undifferentiated carcinoma of the thyroid is more malignant and extremely aggressive, with poorer therapeutic effects and a poor prognosis. Undifferentiated thyroid cancer accounts for about 1% of thyroid malignant tumors, which mainly manifests as lumps in the neck, generally speaking, the growth is not particularly rapid, and the lesions with small volume do not produce pressure symptoms; those with large volume can produce pressure symptoms, resulting in hoarseness, dyspnea, etc., and the adhesion of lymph nodes with surrounding tissues is enlarged, which leads to metastasis from distant places, and the average survival rate is about 3~6 months. The average survival rate is about 3~6 months. For the diagnosis of thyroid malignant tumor, it is recommended to consult the Department of Thyroid Surgery of regular hospitals.