The horizontal position of breast implants also requires a great deal of attention, both in pre-operative planning and in the operating room. Excessive lateral dissection of the implant pockets will result in augmented breasts with an excessively wide space between them in the cleavage area, and the appearance that the breasts are abnormally far apart. The result may (or may not) be tolerable in the upright standing or sitting position, but when the patient lays down in supine position (on one's back) the implants may fall far to the side and produce little to no anterior breast projection in this position. Patients with the problem almost always want it corrected, and the treatment once again is surgical: a lateral repair of the implant space, to restrain the implants from falling off to the side.
Inadequate lateral dissection, on the other hand, will result in an augmentation with an abnormal 'side by side' appearance. It is lateral projection of the breasts beyond the lateral border of the chest wall (in frontal view) that, along with the concavity of the waist profile and the convexity of the hip profile, produces the appearance of an 'hourglass figure'. While one does not want to over dissect the lateral extent of an implant pocket, careful attention must also be paid to ensure that lateral breast projection is not inadequate.
Breast implant base diameter is also of crucial importance. The base diameter (the side-to-side dimension of the implant) must be ideal for the existing horizontal dimension of the breasts preoperatively, as well as the breadth of the anterior chest in general. Obviously, a given implant volume and base diameter that works well for a small-framed patient that is 5'3" will be completely inadequate for a broad-chested patient who is 5'10". One wants to increase cleavage area fullness and lateral breast projection in most cases, and an implant of inadequate base diameter may accomplish only one of those goals, while too wide an implant will be overprojecting in both directions. Careful evaluation of all of these breast and implant dimension issues is necessary if the ultimate goal of the surgery is a natural-appearing breast augmentation.
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