How is a subcutaneous mastectomy different from a normal mastectomy?

No skin removal: A subcutaneous mastectomy removes as much breast tissue as possible without removing any skin of the breast. This may sometimes be performed on women who are at high-risk for breast cancer to lower their risk; it is not an acceptable surgical treatment of breast cancer.

The nipple is intact: Subcu mastectomy leaves the areola and nipple intact but removes 90 to 95ish % of the breast tissue hard to see in upper outer quadrant toward axilla -from the usual inframammary fold incision line- therefore have to be careful in getting all the breast tissue out --- often used in a boy with ptotic gynecomastia ie large breasts.