syndactyly type 6 (MONDO_0017460) is a rare, genetic, non-syndromic, congenital limb malformation characterized by unilateral fusion of second to fifth fingers, amalgamation of distal phalanges in a knot-like structure, and second- and third-toe fusion. Some individuals present only with webbing between second and third toes, without involvement of fingers. Also known as: mitten hand, syndactyly, mitten type, unilateral syndactyly of digits 2-5.