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A rare partial monosomy of the short arm of chromosome 17 with a variable phenotype. The disease has characteristics of prenatal and postnatal growth retardation, developmental delay, mild intellectual disability, macrocephaly, mild facial dysmorphism including prominent forehead, hypertelorism, thick upper and/or lower lip vermillion and structural abnormalities of the brain variably including white matter abnormalities, prominent Virchow-Robin spaces, Chiari I malformation, corpus callosum hypoplasia but not lissencephaly.
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