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Two cases of trisomy 9 are presented with the description of the prenatal sonographic findings prompting prenatal cytogenetics evaluation. The characteristic sonographic abnormalities included structural heart defects; limb, renal, and facial anomalies; and intrauterine growth retardation. The clinical course and cytogenetic and autopsy finding are described.
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Benacerraf et al. (1992) studied this question.
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