If you get an areola incision, can the implant be placed under the muscle?

Personally, An areolar incision can be hidden provided the breast has a large enough areola and short lower pole. Under the muscle is also possible.An exam and consultation with a plastic surgeon is recommended to discuss your options and expectations. 

Hello and thank you for your question. Implants can be placed under the muscle with a peri-areolar incision.  There are several advantages
and disadvantages to over vs under the muscle.  Under the muscle has the
advantage of lower capsular contracture rates, less risk of rippling, and
better visualization with future mammograms.  Most patients say that under
the muscle also has a more natural look and feel.  The size, shape,
and profile of the implant is based on your desired breast
size/shape, your chest wall measurements, and soft tissue quality. 
This decision should be based on a detailed discussion with
equal input from both you and your surgeon.   Make sure you specifically look at before
and after pictures of real patients who have had this surgery performed by your
surgeon and evaluate their results.   The
most important aspect is to find a surgeon you are comfortable with. I
recommend that you seek consultation with a qualified board-certified plastic
surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon