Breast nodule class 4A is a way of determining the nature of breast nodules by ultrasound or mammography. It is divided into six classes: Class 1 mammary hyperplasia; Class 2 nodules, but no blood flow, will not be very large nodules, regular review can be; Class 3 nodules visible blood flow, usually need surgery, but the nodules tend to benign; Class 4 nodules is to indicate that the nodules malignant does not exclude, it is divided into three classes, 4A, 4B, 4C. 4A is the degree of malignancy is not more than 30%. For nodules in class 4A, it is recommended to perform out needle aspiration biopsy or surgical examination. If you are afraid of surgery, you can follow up closely, that is, you have to review ultrasound or mammogram once in three months. For these nodules, surgical examination is routinely recommended as the safest option.