Thyroid ultrasound TI-RADS grading Ultrasound will TI-RADS grading as follows: Grade 0: no abnormalities 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: the examination is benign, the risk of malignant tumor is 0%, all need clinical follow up. Yang Hui, Department of Nuclear Medicine, Henan Cancer Hospital Grade 3: Probably benign, risk of malignancy is <2< span="">%, 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 greatest likelihood of cancer < 95% Grade 6: Cytologically detected cancer. Definite diagnosis of cancer!