Breast category 4a refers to breast nodules BI-RADS category 4a with calcification Whether it is serious or not needs to be decided according to the nature of the nodule, and needs to be accompanied by further examination. 1. Not serious: BI-RADS category 4a belongs to the higher level of breast nodule classification and is the mildest of the 4 categories, with a probability of malignancy between 2% and 10%. It is recommended to perform lumpectomy or puncture biopsy. If the result is benign, it is not particularly serious, and regular follow-up examinations are needed to keep an eye on the changes of the nodules and calcified areas. 2. Serious: If the results of surgical excision or tissue removal for pathological examination suggest malignancy, it is a more serious case. Once it is clear that it is a malignant tumor, it is necessary to undergo a comprehensive treatment mainly based on surgical treatment. As each patient’s breast nodule is different, it is recommended that the patient should consult a doctor in time and follow the doctor’s instructions after a clear diagnosis.