BEFORE PHOTOGRAPH: This is a frontal view of a 31 year old woman who had differently sized breasts prior to undergoing breast reduction surgery.   No two sides of the human body are identical.  In the case of the breasts, it is very common to find marked differences between the breasts.  This is normal and can be related to differences in the shape of the right and left sides of the rib cage on which a woman's breasts sit, the shape of her spine (i.e. whether or not a woman has scoliosis and to what degree it is present), differences in the developement of each breast and whether or not she breast fed preferentially on one side.