A congenital defect characterized by anterior protrusion of the lower sternum and xiphoid process is termed:

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Pectus carinatum, also known as "pigeon chest", is a congenital defect that causes the sternum and xiphoid process to protrude anteriorly, creating a rounded or bulging appearance of the chest. Pectus excavatum is the opposite condition, where the sternum appears sunken or indented. Flail chest is a condition where several consecutive ribs are broken in two or more places, causing a segment of the chest wall to move independently from the rest of the thorax, usually as a result of severe trauma. "Sternal protrusion" is not a commonly used medical term for any specific condition.

A Congenital Defect Characterized by Anterior Protrusion of the Lower