As the number of patients with thyroid nodules increases, and ultrasound is the main method of thyroid nodule examination, many patients encounter ultrasound reports that say how many levels of TI-RADS, what does this mean? Here is the answer: TI-RADS is a thyroid imaging reporting and data system that is divided into 6 levels: Level 0: no abnormalities seen on ultrasound in clinically suspected cases, additional tests are needed. Grade 1: Negative, with normal size and echogenicity of the gland, no nodules, cysts or calcifications. Grade 2: benign with 0% risk of malignancy, all requiring clinical follow-up. Grade 3: Probably benign, risk of malignancy is <2%, puncture biopsy may be required. Grade 4: The probable percentage of malignancy is 5 to 50% need to combine with clinical diagnosis! Grade 5: Suggests the highest likelihood of cancer at <95% Grade 6: Cytologically detectable cancer. Definitely diagnosed as cancer!