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A rare chromosomal anomaly syndrome resulting from the partial duplication of the long arm of chromosome 6. The disorder has a highly variable phenotype with typical characteristics of 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.
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