A category 3 breast nodule is a nodule with a high likelihood of being benign and a malignant risk of 1 to 2%; clear borders are defined as well-defined margins, and hypoechoic is defined as echogenicity below the breast fat. The BI-RADS (Breast Imaging and Data System) classification of breast nodules is an assessment of the risk of malignancy of a nodule based on imaging findings such as ultrasound.A category 3 nodule is one that has a high likelihood of being benign, with a 1 to 2% probability of malignancy. Category 3 nodules are most often caused by benign conditions such as fibromas, intraductal papillomas, and breast hyperplasia, and there is also a 1 to 2% chance that they are caused by malignant tumors such as breast cancer. Clear border is a description of the edge of the nodule. Generally, the edge of benign nodule is clear, while the edge of malignant nodule is unclear, so the clear border is mostly a manifestation of benign nodule. Hypoechoic refers to a nodule that is less echogenic than the surrounding fatty tissue, which can be caused by benign or malignant breast diseases. The following are some examples of hypoechoic nodules, Generally speaking, the three types of breast nodules with clear borders and low echogenicity need to be followed up and observed. Patients are advised to consult their specialists and follow the doctor’s instructions for follow-up, examination and treatment.