label: polysyndactyly 4
label_lc: polysyndactyly 4
description: "Polysyndactyly or PPD4 is a form of preaxial polydactyly of fingers, a limb malformation syndrome, characterized by the presence of a thumb showing the mildest degree of duplication, being broad, bifid or with radially deviated distal phalanx. Syndactyly of various degrees of third-and-fourth fingers is occasionally present."