Pectus excavatum and pectus carinatum are both types of deformities of the anterior chest wall, with pectus excavatum being the most common deformity, accounting for 90% of all anterior chest wall deformities; the incidence of pectus carinatum is only one-fifth to one-sixth of that of pectus excavatum. The shapes of pectus excavatum and pectus carinatum are also completely different. Pectus excavatum appears as if a funnel were placed on the chest, with the funnel receding backward and downward. Therefore, patients with pectus excavatum, when lying down, can observe a depression in the front of their chest, which is even capable of holding a cup of water placed within this funnel-like depression. On the other hand, the deformity in pectus carinatum protrudes forward. One caves inward while the other protrudes forward, thus these two shapes are completely opposite.