Implants appear smaller once placed under the muscle

It is true that implants appear smaller once they are placed in surgery compared to the sizers you try in the office. Below the muscle placement will appear smaller than above the muscle. The difference is likely going to be around 10% so with the implants you are choosing it will be about 30cc. Remember that is barely noticeable, however. Review your sizing with your surgeon. There are measurements to consider that are specific to the diameter of your chest, skin coverage, looseness of your skin as well as your desire for a specific cup size. Taking everything into consideration will provide you with the best outcome.

The general rule of thumb is that whenever you use a sizer placed externally to estimate the desired implant volume, use a similar sized implant if it is ti be placed subglandular and 10-15% if placed submuscular.

ESTIMATE OF IMPLANT VOLUME

SUBGLANDULAR IMPLANT

Implant volume = Sizer volume

SUBMUSCULAR IMPLANT

Implant volume = 110-115% Sizer volume

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A augmentation patient does not lose volume when placed behind the muscle.  The implant is a closed system, volume goes neither in or out. The breast will change over the first few months as the pec muscle stretches, in it's shape.  The sizes you have chosen seems very reasonable.  Good Luck.