This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Popliteal pterygium syndrome is a condition that affects the development of the face, skin, and genitals. Most people with this disorder are born with a cleft lip and/or a cleft palate. Other symptoms may include depressions (pits) near the center of the lower lip, small mounds of tissue on the lower lip, or missing teeth. Other features may include webs of skin on the backs of the legs across the knee joint (popliteal pterygium), webbing or fusion of the fingers or toes (syndactyly), triangular shaped folds of skin over the nails of the large toes, and tissue connecting the upper and lower eyelids or the upper and lower jaw. Affected people may also have abnormal genitals. There is no growth delay and intelligence is usually normal. Inheritance is autosomal dominant. It is caused by mutations in the IRF6 gene. Treatment may include reconstructive surgery for the oral defects, such as the cleft lip and cleft palate, and for other defects such as the popliteal pterygium or abnormal genitalia.
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