Pigeon chest

Pigeon chest, also called Pectus carinatum (L carinatus, equiv. to carin(a) keel) is a deformity of the chest characterized by a protrusion of the sternum and ribs. It may occur as a solitary congenital abnormality or in association with other genetic disorders or syndromes : Marfan syndrome, Morquio syndrome, Noonan syndrome, Trisomy 18, Trisomy 21, homocystinuria, osteogenesis imperfecta, multiple lentigines syndrome, and Sly syndrome. In about 25% of cases of pectus carinatum, there is a family history.