obsolete Billet Bear syndrome https://github.com/monarch-initiative/mondo/issues/7403 https://github.com/monarch-initiative/mondo/issues/7558 https://rarediseases.info.nih.gov/diseases/892/billet-bear-syndrome true MONDO:0022577 lower limb partial duplication renal agenesis OBSOLETE. A congenital malformation syndrome characterized by partial duplication of the left lower limb and aplasia of the ipsilateral kidney, plus other congenital malformations.