Ultrasound can detect breast cancer and can make a preliminary clinical determination to assess the likelihood of developing breast cancer. Currently, non-invasive examinations, or ultrasound, are usually used to grade breast lumps to make a preliminary determination of their benignity or malignancy until a pathological diagnosis is obtained. In general, a grade below IV usually represents a benign mass, while a grade above IV has a certain possibility of malignancy, and the higher the grade, the greater the possibility of malignancy. The higher the grade, the higher the possibility of malignancy. The grading is mainly based on whether the mass has clear borders in ultrasound imaging, whether the blood supply is good, and whether the longitudinal to transverse diameter ratio exceeds one, and whether it is accompanied by calcification. Generally, the possibility of malignancy is about 5% for grade IVa, 5%-50% for grade IVb, and more than 50% for grade IVc. If it is grade V, it can be clinically diagnosed as breast cancer. Therefore, breast ultrasound can determine whether there is breast cancer or the possibility of breast cancer, but the only way to confirm the diagnosis is through pathological examination.