How many cc's are lost going under the muscle ? And how much a difference between 350 and 375 hp?

Thank you for sharing your excellent question.  In terms of appearance patients do not lose any cc's by going underneath the muscle as the implant will redistribute its volume to the lower portion of the implant as it "drops" during the healing process.  In most cases 25cc is not a substantial difference when considered over the entire size of an implant, but this will depend on your current frame.  Talk to your surgeon about your desired goals they should be able to best steer you to the right size to meet your expectations. 

Thank you for your inquiry and photos. Without a physical
examination it is difficult to respond with accuracy, but whether or not your implant is under the muscle or above the muscle will not impact on the volume. You are probably asking if the "look" will be different and this is based on many factors, including the thickness of your breast tissue. Most plastic surgeon recommend the placement be under the muscle for many reasons. The best way to
determine which breast implant size is best for you is by first finding out
your specific wishes not only with words or letters as in cup size or “not too
big” or “natural”, but also with a visual understanding of what you hope to
look like. This can be accomplished either with photographs of patients whose
breasts and body type look like you, or ideally with photos of patients not
only whose breasts and body type visually are similar to yours, but are also a
similar height, weight, and pre-operative breast size. In our own practice we
have provided that unique functionality on our website to accomplish exactly
that.

Unfortunately the most common reason for a woman to be
unhappy after her augmentation is feeling as though she is either too big or
not big enough. Thankfully, in our practice this is rarely a problem because
implant size selection is what we spend most of our time discussing and
determining. I do not place the onus of selecting the breast implant size on my
patients since they are coming to me for my advice and expertise, but I do ask
my patients to be as specific as possible about their aesthetic goals and I then
advise them accordingly.

I would advise you to seek the advice of a board certified
plastic surgeon experienced in breast enhancement surgery and make sure that
your own sense of aesthetics aligns with that of your plastic surgeon. Your
idea of “natural” or “pretty” or “proportionate” might be different from your
plastic surgeon’s and it is very important for you to feel confident that you
are both of like minds as far as the goals. Best of luck to you and I hope you
are successful in achieving the enhancement you are seeking.

The implant volume is what it is. Because one often tries them on by putting them in a bra, they tend to look slighlty larger this way.  How much is hard to predict.

None are lost, just a little different form typically and a little longer to reach final projection behind. Twenty-five ccs is only a shot or two of Tequila, almost imperceptible in that range. Breast augmentation is a dimensional operation, not a volume operation. Obviously you end up with a "volume", but it is how it is dimensionally distributed that determines your result.

Thanks for sharing your question. I can
appreciate your concern.Biology can not be compared with engineering. The usual size difference between implant sizes is 5 millimeters in width and 3 millimeters in height for every 50 cc. At the end the understanding of the look that you want to get and the anatomy of your body will allow for the best result.

Finally, make sure that you have a
consultation with a board certified plastic surgeon.

Wishing you the best in your journey