TIRADS classification 4a, plus 5.8mm*1.9mm*1.7mm in size, is a diagnostic description of thyroid nodules by thyroid ultrasound and generally does not determine the severity of the condition. TIRADS classification is a grading index for thyroid nodules, which can be categorized into 1 to 6 categories, with category 1 being normal thyroid, category 2 being benign nodules, and category 3 being possibly benign nodules (risk of malignancy <5%), and the TIRADS classification is 4a, which suggests that the malignancy of this nodule is between 2% and 10%, and that it needs to be taken seriously. However, because of the small size of the nodule, ultrasound-guided puncture is generally not recommended, and follow-up review is recommended as prescribed by the physician.