Ring chromosome 9 syndrome is an autosomal anomaly characterized by variable clinical features, most commonly including developmental delay, some degree of intellectual disability, facial dysmorphism, microcephaly, congenital heart anomalies, and variable genital, limb and skeletal anomalies. The disease is Monarch Disease Ontology identifier MONDO_0019905 (ring chromosome 9). Also known as: Chromosome 9 Ring, Ring 9, Ring chromosome type 9.