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A rare chromosomal anomaly syndrome with a highly variable phenotype. Principle characteristics are a neonatal mewing cry, severe developmental delay and intellectual disability, short stature, hypotonia, dysmorphic features (including microcephaly, facial asymmetry, hypertelorism, epicanthal folds, abnormal ears, micro/retrognathia), congenital cardiac anomalies (such as atrial and ventricular septal defect, tricuspid insufficiency, hypoplastic aorta) and skeletal abnormalities (for example hypoplastic thumbs, anomalous ulna/radius, dysplastic metacarpals and phalanges).
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