Popliteal pterygium syndrome

Popliteal pterygium syndrome (PPS) is an inherited condition affecting the face, limbs, and genitalia. The syndrome goes by a number of names including the popliteal web syndrome and, more inclusively, the facio-genito-popliteal syndrome. The term PPS was coined by Gorlin et al.. in 1968 on the basis of the most unusual anomaly, the popliteal pterygium (a web behind the knee).