SALINE: When saline-filled breast implants rupture, they deflate and the saline solution leaks into your body immediately or over a period of days. You will notice that your implant loses its original size or shape. Rarely, saline implants can have a slow leak from the area of the fill valve. In this situation, the reduction in implant volume may be more gradual.
SILICONE: If your silicone gel-filled breast implant ruptures, it is likely that neither you nor your doctor will know. This is known as a silent rupture. This is why MRI is recommended at three years after implantation and then every two years thereafter to screen for rupture. However, sometimes there are symptoms. These symptoms include hard knots or lumps surrounding the implant or in the armpit, change or loss of size or shape of the breast or implant, pain, tingling, swelling, numbness, burning, or hardening of the breast.