Grade 0: Incomplete evaluation, requiring recall (recall), additional imaging for further evaluation or comparison with the previous film. Grade Ⅰ: negative X-ray film with no abnormal signs. Grade II: benign changes, no malignant X-ray signs, can be routinely followed up. Grade III: benign possibility, short-term follow-up is recommended. Grade IV: suspicious abnormality, biopsy should be considered. Grade V: high suspicion of malignancy, appropriate measures should be taken immediately (the possibility of detecting malignancy is greater than 95%). Grade VI: Biopsy has been performed to confirm malignancy, and appropriate measures should be taken immediately.