Noonan syndrome is a genetic disorder that affects various parts of the body, causing a wide range of physical and developmental features. It is characterized by distinctive facial features, short stature, congenital heart defects, and developmental delays. Other symptoms may include pectus excavatum (sunken chest), webbed neck, and bleeding disorders. Noonan syndrome is caused by mutations in several different genes that are involved in the RAS-MAPK signaling pathway, which plays a key role in the development and function of cells. Treatment may involve management of symptoms and complications associated with the disorder.