Breast category 4a refers to the ultrasound score of the degree of benignity and malignancy of breast hyperplasia nodules. Breast nodule 4a generally refers to the possibility of malignancy of breast hyperplasia nodules, but most of the nodules are benign. If it is determined that breast nodule 4a is benign and there is swelling and pain in the breast, localized warm compresses and physical therapy are recommended. Breast 4a examination includes breast molybdenum target, breast ultrasound and breast resonance examination, the probability of breast nodule 4a being benign is 95%, and the probability of malignancy is only about 3%. It is recommended to go to a regular hospital for examination, which can be performed by puncture or excision of the cause of the disease. If malignant, a variety of treatment programs need to be developed, and need to actively cooperate with the treatment. Breast 4a is a way of grading breast nodules, which generally means that the breast nodule reaches BI-RADS grade 4 in ultrasound or molybdenum target grading. If it is grade 4a, it means that the breast nodule is irregular and malignancy is suspected in the imaging examination.