Breast enlargement surgery (also known as augmentation mammaplasty) is the most commonly performed cosmetic surgical procedure in the United States. Surgery involves the placement of an implant under the breast tissue or muscle, or reshaping of natural tissue to enhance the size or shape of the breast. This may be for aesthetic reasons, male-to-female gender reassignment surgery or reconstructive surgery for women who have lost one or both breasts to cancer. Compare breast enlargement options world wide now!