Mondo Description A rare, genetic, congenital limb malformation disorder characterized by hypoplasia or absence of central digital rays of the hands and/or feet and the presence of one or more, unilateral or bilateral, supernumerary digits on postaxial rays, ranging from hypoplastic digits devoid of osseous structures to complete duplication of a digit. Cutaneous syndactyly, symphalangism and clinodactyly have also been reported. There have been no further descriptions in the literature since 1982.