Thyroid cyst TI-RADS2 category refers to thyroid nodules that tend to be benign and are usually categorized into 1 to 6 based on the imaging signs of thyroid nodules under ultrasound, with higher grades representing a greater likelihood of malignancy. Class 1.1: Indicates that the gland may be normal in size and echogenicity, with no nodules, cysts or calcifications, and no risk of malignancy. Category 2.2: indicates a benign nodule, predominantly cystic, usually without risk of malignancy. Category 3.3: Indicates a probably benign nodule with less than 2% risk of malignancy. Category 4.4: indicates a suspected malignant nodule with a 2%-90% risk of malignancy. Category 5.5: Considers a probable malignant nodule with a risk of malignancy greater than 90%. Category 6.6: Indicates a malignant nodule that has been diagnosed after pathologic biopsy. If the patient is only tirads category 2 nodules, benign is the most common, do not need to be particularly worried, under the guidance of the doctor regular follow-up, every six months regular review can be.