One of the causes motivating a revision mammoplasty procedure is the breasts implant being chosen too wide for the breast frame.
When the breast base is narrower than could be expected by the vertical breast dimension and overall chest and patient's height, great care has to be taken by the surgeon performing augmentation mammoplasty in choosing narrow enough implants not to over fill any quadrants of the breast, otherwise the results will be poor due to showing excessive fullness in some areas, specially at the side of the chest and armpit causing a lateral excess side boob, the inner cleavage causing uniboob or symmastia, upper pole causing implants riding too high and lower pole causing bottoming out, which would surely entail a revision mammaplasty procedure in the future.