Hypoechoic right breast nodule category 4 refers to a hard nodule in the right breast that appears as a hypoechoic mass during ultrasound examination. It is classified as category 4, which is a relatively serious condition with a higher probability of cancer than half of the cases. Breast nodules refer to small hard lumps with abnormal development at the edges of the breast. Depending on their benign and malignant nature, the image characteristics presented in an ultrasound examination or mammogram are also different and can be classified into 1, 2, 3 and 4 types. Because this type affects the diagnosis basically to determine the malignant condition of the nodules, so type 4 would require further sampling to further confirm whether the breast tumor has become malignant, and then do the corresponding treatment according to the examination results.