Mixed foci of 0.6cm x 0.3cm in the dorsal aspect of the upper pole of the left lobe of the thyroid gland suggests that there is a tumor in the thyroid gland here, but it is usually a benign tumor, and malignant tumor cannot be excluded. 1. Benign tumors: mainly include thyroid adenoma, nodular goiter and thyroid cyst, which are benign thyroid tumors. When the tumor gradually increases, mixed foci will be found through imaging examination, but the growth rate of this type of tumor is relatively slow, and it is generally not easy to turn into cancer. 2. Malignant tumors: mainly include papillary thyroid carcinoma, follicular carcinoma; they may also be undifferentiated thyroid carcinoma and medullary carcinoma. These are malignant tumors in the thyroid gland, and when the tumor gradually increases in size and compresses the surrounding tissues, mixed foci will be detected. Mixed foci on the left lobe of the thyroid and on the dorsal side. It may be benign or malignant, in order to accurately differentiate, puncture pathology biopsy should be done as soon as possible to understand the nature of the nodule before standardized treatment.