Monarch Disease Ontology term MONDO_0017794 (Xq12-q13.3 duplication syndrome) is a rare chromosomal anomaly syndrome, resulting from the partial duplication of the long arm of chromosome X, characterized by global developmental delay, autistic behavior, microcephaly and facial dysmorphism (including down-slanting palpebral fissures, depressed nasal bridge, anteverted nares, long philtrum, down-slanting corners of the mouth). Seizures have also been reported in some patients. Also known as: dup(X)(q12-q13.3).