Hypertelorism-hypospadias-polysyndactyly syndrome is a very rare syndrome associating an acro-fronto-facio-nasal dysostosis with genitourinary anomalies.

Supernumerary digits located at the radial side of the hand. Polydactyly (supernumerary digits) involving the thumb occurs in many distinct forms of high variability and severity. Ranging from fleshy nubbins over varying degrees of partial duplication/splitting to completely duplicated or even triplicated thumbs or preaxial (on the radial side of the hand) supernumerary digits.