Woman's breasts play a fundamental role in the self esteem, perception of feminity, psychological confidence, sexual sphere, gender assignment and acceptance of body morphology.
Ribcage and breast positioning deformities do indeed affect how any breast is naturally settled, developed, oriented, etc, much more if any mammary surgery is to be applied like breast implants, mastopexy or breast reduction.
There exists a very specific type of breast where the mammary mound is not canonically filling the whole of the corresponding half of the chest available for the breast; this can be due to genetically inherited causes producing the lack of fullness of the inner cleavage.
When the breast tissue base is narrower than the skeletal available ribcage space for the mammary mount, great care has to be taken by the surgeon performing augmentation mammoplasty in choosing wide enough implants to fill up all the quadrants of the breast, otherwise the results will be poor due to showing hollow breast areas, specially at the inner cleavage, with emptiness, lack of plenitude and too far apart wide cleavage breasts, which would surely entail a revision mammaplasty procedure in the future.