The scapula is fixed to the first rib by a
congenitally short costocoracoid ligament. The rib cage may be narrow and
the shoulders sloping. The contour of the anterior clavicle is lost, the
shoulders rounded, and the scapular motion limited. Movements depending on
rotation or retraction of the scapula are limited, but usually do not
interfere with normal activities. Surgical excision of the costocoracoid
ligament results in some correction of the cosmetic deformity.