Clinical studies have found that 3%-5% of patients with category 4a thyroid nodules are at risk of developing cancer. Even if the category 4a thyroid nodules are small, the following clinical management methods are often available. 1. Ultrasonography of the thyroid can be improved to clarify the specific nature of the nodule. If ultrasonography reveals thyroid nodule morphology and structure, benign lesions are mostly considered. The patient is advised to review the thyroid ultrasound once in 3-6 months and may not need surgery for the time being. 2. If a 4a thyroid nodule is found to have significant calcification foci, rich blood flow signal and aspect ratio greater than 1 during general ultrasound examination, the patient is advised to undergo ultrasound-guided fine needle aspiration to further clarify the specific nature of the nodule. If malignant tumor cells are detected by puncture smear, radical thyroid cancer treatment under general anesthesia needs to be performed as soon as possible. Intraoperative lymph node dissection of the central group of the lateral cervical group is required, and postoperative radiotherapy can be combined with iodine 131, and most patients can often achieve better treatment results.