Chest wall shape is very important when thinking about breast augmentation. The breast is located on the chest. The breast is located on top of the pectoralis and serratus muscles. Under these chest muscles are the ribs. The ribs connect to the body in the back at the spine. This is important because the shape and position of a breast is influenced by the curvature of the ribs that the breasts are positioned on top of. If the spine is crooked or the ribs have a different curve, the breasts will be in different positions and look different.

It is very common that a woman will have a curvature in the ribs or spine that influence how their breasts appear on their chest. It is one of the most underevaluated areas when a woman is being examined for a breast augmentation. These chest wall influences on breast position and shape can be magnified after a breast implant is put in. This can be an example of a breast asymmetry.