Pectus excavatum, also known as sunken or funnel chest, is a congenital chest deformity that affects the breastbone and ribs, causing the chest to appear indented or sunken. There are several synonyms for pectus excavatum, such as concave chest, cobbler's chest, hollow chest, or keel-shaped chest. While pectus excavatum is a fairly common condition that affects roughly 1 in 400-1000 individuals, it can cause a range of issues, including compression of the heart and lungs, poor posture, and self-esteem issues. Treatment options for pectus excavatum include observation, exercises, braces, or surgery in more severe cases.