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  • A rare autosomal anomaly due to the presence of an extra copy of chromosome 4 in a fraction of all cells with a variable phenotype. Typical characteristics are intrauterine growth retardation, low birth weight/length/head circumference, mild intellectual deficit, congenital heart defects, hypertrophic cardiomyopathy, dysmorphic features (asymmetry of the face, eyebrow anomalies, low-set, posterior rotated, dysplastic ears, micro-/retrognathia), characteristic thumb abnormalities (aplasia, hypoplasia) and skin abnormalities (hypo/hyperpigmentation). Delayed puberty may be associated.
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