The Cockayne syndrome is an autosomal recessive syndrome of growth failure and characteristic physical and pathological changes. Typically the disorder becomes manifest in the second year of life; growth and development are normal during the first year. We report presumably monozygotic twins with otherwise classic Cockayne syndrome but with a prenatal onset. Several previously described cases seem to represent a similar form of Cockayne syndrome with early onset of growth failure and development delay.
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