Synmastia is a medical term that describes what happens when breast implants are placed too close together and actually touch. it can also refer to a natural condition unrelated to surgery, when natural breast tissue touches in the midline or sternum of the chest, resulting in what may appear to be just 1 breast.
Synmastia is aesthetically not normal. Even in women with very large natural breasts without surgery, typically their breasts will not touch in the midline.
Without support, like a bra, your breasts should normally fall slightly down and separate in the middle. Most women will be able to see and feel their sternum, the bony chest plate. This is normal, and even with breast augmentation, your breasts should also do this after surgery.
With or without breast implants, your breasts will typically touch only with a cleavage inducing bra or underwire bra.
Without any support your breasts have about 1 inch, or 2.5 centimeters, of space between the right and left breast. Some women with natural breast tissue have a larger distance between the right and left breasts.
Choosing breast implants with the proper profile is the key characteristic to ensure that you have the appropriate amount of space between your right and left breasts. The width of your breast implant should match the width of your breast tissue. Measuring before surgery and deciding on the appropriate width implant, coupled with the elasticity of your skin, will help achieve the best long-term result.
Another concern to avoid synmastia during surgery is to avoid creating a pocket for the breast implant that is too wide, and touches in the middle. Although rare, it can happen, and over dissection in the middle of your chest should be avoided by your plastic surgeon to ensure the best possible long-term result.
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