NS: Noonan syndrome, a multifaceted condition characterized by a series of birth defects (congenital malformations) including short stature after birth (postnatal growth retardation), webbing of the neck (pterygium colli), caved-in chestbone (pectus excavatum), narrowing of the artery from the heart to the lungs (pulmonic stenosis) and, in boys, te... Found on http://www.medterms.com/script/main/art.asp?articlekey=6446