The normal adult female breast is divided from the outside into: nipple, areola and skin. From the most superficial skin layer to the anatomical structure of the chest wall, it is divided into: skin, subcutaneous fat, superficial fascia, Cooper’s ligament, breast tissue (breast layer), posterior breast fat (posterior breast gap), deep superficial fascia, pectoral muscle, rib cage, and rib membrane. We usually see breast disease refers to the breast layer, the rest of the layers of disease can also be rare, in addition to the filling material used in breast augmentation is mostly located in the posterior interstitial space, women often inadvertently in the shower when they feel the lump or late premenstrual pain will consider going to the hospital for breast ultrasound, it is recommended that women with a family history of disease can have an annual ultrasound examination of the breast Oh.