Congenital Limb Abnormalities By Simeon A Boyadjiev Boyd, MD, University of California, Davis Reviewed / Revised Sep 2022 View Patient Education Diagnosis Treatment Topic Resources Radial Ray Deficiency VACTERL (Upper Extremity... VACTERL (Lower Extremity... Polydactyly Syndactyly (Complex) Congenital limb defects involve missing, incomplete, supernumerary, or abnormally developed limbs present at birth.