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Is It Possible for One Breast to End up Smaller than the Other, if They Had the Same Size Silicone Implant?

Yes. It is possible for one breast to look smaller than the other even when the exact same size silicone implant is placed in both breasts. Breast implants themselves may be identical, but the natural breasts and underlying chest anatomy are rarely perfectly symmetrical. Before surgery, one breast may have more natural breast tissue, a different shape, a wider or narrower breast base, or a different amount of skin. The chest wall and ribs can also be asymmetric. All of these factors can affect how the same implant looks once it is placed. For this reason, using the same size implant in both breasts does not necessarily produce identical-looking breasts. In some patients, surgeons intentionally use different-sized or differently shaped implants to improve pre-existing asymmetry. It is also important to remember that breast augmentation improves symmetry but cannot guarantee perfect symmetry. The goal is usually to create breasts that are as balanced and proportional as possible rather than perfectly identical. If one breast looks smaller immediately after surgery, don't assume that the final result has been determined. Breasts can settle and soften at different rates, and it may take several months for the final result to become apparent.

Clinical Context

Symmetry after augmentation depends on your own anatomy, not just implant size. Differences in chest wall shape, muscle, and skin elasticity affect how each implant settles. One side may sit slightly higher, lower, or more forward than the other, even with identical implants. Swelling and tissue relaxation continue for months after surgery, so early asymmetry often improves as the breasts settle into their final shape.

Answered By

Dr. Steven Williams

President Emeritus of ASPS

Dr. Steven Williams is a board-certified plastic and reconstructive surgeon, a diplomate of the American Board of Plastic Surgery, the Past President of the prestigious American Society of Plastic Surgeons, and a charitable person who dedicates his life to those in need of his unique expertise.

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