It's possible you might be thinking of this, I'd ask why the interest, (not to be rude).
Fat Grafting
Fat grafting, also called autologous fat transfer, is emerging as a new breast reconstruction technique. In fat grafting, fat tissue is removed from other parts of your body – usually your thighs, belly, and buttocks – by liposuction. The tissue is then processed into liquid in a lab and injected into the breast area to recreate the breast. http://www.breastcancer.org/treatment/surgery/reconstruction/types/autologous/fat-grafting