There are two different shape abnormalities to which the term "double-bubble" is applied. Unfortunately there is some confusion because of the two conditions.
Strictly defined, the "double-bubble" look is a particular deformity of shape in which the round part of the breast produced by the implant sits at the normal level for a young "perky" breast, but the breast itself and the nipple have sagged downward with time. Getting this "double-bubble" shape usually requires that all three of the following factors be present:
Correction of this type of double-bubble look requires a breast lift or mastopexy in most cases.
The other kind of shape sometimes referred to as "double-bubble" is also more common after under-the-muscle implants, but can be seen with both unders and overs. It occurs when the pre-operative crease is very sharp, indented or constricted, and produces a visible groove partway between the nipple and the new lower crease, separating a bulge above from a bulge below. Most often, this condition gradually clears up if the tissues at the groove stretch out adequately, but if not, operation may be appropriate.
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