a congenital deficiency of frontal chest tissue. There is a spectrum of severity ranging from slight deficiency of the pectoralis major chest muscle to absence of a breast or ribs or deficiencies in the arm of the same side of the body. Treatment depends on the severity of the syndrome. Complete absence of the pectoralis major is treated by shifting a muscle from the back to the chest to achieve the proper contour and improve arm strength. Lesser chest deficiencies are usually camouflaged using custom made silicone implants.