The trans-umbilical incision is placed at the top of the belly-button. Its obvious advantage is a lack of scars on, around, or near the breasts. Its disadvantages are blind dissection, making asymmetry more common, and making the likelihood of one side being submuscular and the other subglandular more likely. If an undesirable result is obtained, a new incision will be needed to correct the problem. It may also damage the breast implants, and cannot be used with pre-filled silicone breast implants.