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The first prenatally diagnosed case of 49,XXXYY is reported. The pathological findings of the fetus included bilateral clinodactyly, decreased carrying angles (OO), and hypertelorism, slightly low set ears and mildly prominent forehead. A minimum of two independent non‐ disjunctional events are postulated for this polysomy to arise.
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Benn et al. (1982) studied this question.
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