Facio-genito-popliteal syndrome, or popliteal pterygium syndrome, is a very rare anomaly consisting of various combinations of facial deformities (cleft lip/palate, lip pits, syngnathia), popliteal pterygia, and genital deformities. We have found 56 cases previously recorded in the literature.
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Hamamoto et al. (1984) studied this question.