Pectus carinatum, also known as "pigeon chest," is a congenital condition characterized by an outward protrusion of the breastbone. This appears to arise due to a combination of genetic and environmental factors, which make an individual susceptible to overgrowth of the breastbone cartilage, which usually becomes prominent during the early pre-teen to teenage years. It is a moderately rare condition, affecting around 1 in every 1,500 births.[1] It is much more common in males, with around 4—5 times more cases seen in boys compared to girls.[2,3]