Breast ultrasound category 3 indicates a birads category 3 breast nodule, MRI 4c, indicates and the possibility of malignant lesions, and further pathology is usually required to make a definitive diagnosis. Breast ultrasound category 3 generally indicates the presence of certain lesions in the breast, which may be breast fibroadenomas or nodules formed by breast hyperplasia. category 3 lesions are mostly benign, but there is also the possibility of cancer. When the general examination shows a category 3 breast ultrasound, it is necessary to periodically review the breast ultrasound to dynamically observe the changes in the size and nature of the hyperplastic nodule. A breast MRI result of grade 4C represents a highly malignant possibility, and usually requires a puncture or excisional biopsy as soon as possible to clarify the nature of the pathology. Patients should strictly follow the doctor’s instructions when checking breast b ultrasound category 3 and MRI 4C, and carry out reasonable treatment under the doctor’s guidance.