A manufactured sac that is filled with silicone gel (a synthetic material) or saline (sterile saltwater). The sac is surgically inserted to increase breast size or restore the contour of a breast after mastectomy. Because of concern about possible (but unproven) side effects of silicone, silicone implants are presently available only to women who agree to participate in a clinical trial in which side effects are carefully monitored.
Tags: B, Cancer Dictionary