Breast implant
Since the late nineteenth century, breast implants have been used to surgically augment the size (volume), modify the shape (contour), and enhance the feel (tact) of a woman's breasts. In 1895, surgeon Vincenz Czerny effected the earliest breast implant emplacement when he used the patient's autologous adipose tissue, harvested from a benign lumbar lipoma, to repair the asymmetry of the breast from which he had removed a tumor. In 1889, surgeon Robert Gersuny experimented with paraffin injections, with disastrous results.
Sex reassignment surgery (male-to-female)
Breast augmentation is the enlargement of the breasts. Some trans women choose to undergo this procedure if hormone therapy does not yield satisfactory results. Usually, typical growth for trans women is one to two cup sizes below closely related females such as the mother or sisters. Estrogen is responsible for fat distribution to the breasts, hips and buttocks, while progesterone is responsible for developing the actual milk glands. Progesterone also rounds out the breast to an adult Tanner stage-5 shape and matures and darkens the areola.