Cooks syndrome is a malformation syndrome affecting the apical structures of digits and presenting with hypo/aplasia of nails and distal phalanges. More than half of digits are usually involved and the thumbs may appear digitalized. The disease is Monarch Disease Ontology entry MONDO_0007134 (Cooks syndrome). Also known as: ODP, anonychia-onychodystrophy with hypoplasia or absence of distal phalanges syndrome.