Monarch Disease Ontology identifier MONDO_0007041 (Apert syndrome) (AS) is a frequent form of acrocephalosyndactyly, a group of inherited congenital malformation disorders, characterized by craniosynostosis, midface hypoplasia, and finger and toe anomalies and/or syndactyly. Also known as: ACS1, acrocephalosyndactyly type 1, acrocephalosyndactyly type I, type I Acrocephalosyndactyly.