Distal trisomy 6q is a rare chromosomal anomaly syndrome resulting from the partial duplication of the long arm of chromosome 6, with highly variable phenotype, typically characterized by growth and developmental delay, intellectual disability, craniofacial dysmorphism (microcephaly, flat facial profile, frontal bossing, hypertelorism, downward-slanting palpebral fissures, flat nasal bridge, anteverted nares, bow shaped mouth, micrognathia), short webbed neck and joint contractures. Cardiac, urogenital, ophthalmologic and hand and foot anomalies, as well as umbilical hernia, spasticity, and seizures, are other features that have been reported. The disease is Monarch Disease Ontology identifier MONDO_0019881 (distal trisomy 6q). Also known as: Chromosome 6, Partial Trisomy 6q, distal duplication 6q, distal trisomy type 6q, telomeric duplication 6q, trisomy 6qter.