FATCO Syndrome or fibular hypoplasia, tibial campomelia, oligosyndactyly, is an extremely rare genetic birth defect that results in underdeveloped or unformed bones in the leg and fewer than five toes on each foot. In some cases, the arms may also be affected. From Parenting & Children's Health Resources Must All Wisdom Teeth Come Out? Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19 Reviewed on 4/16/2020 References Smets, Gitte, Yoeri Vankan and Annick Demeyere. A Female Newborn Infant with FATCO Syndrome Variant (Fibular Hypoplasia, Tibial Campomelia, Oligosyndactyly) – A Case Report. Feb 26, 2016. 2016. .