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To assess differences between fetuses with isolated and non-isolated trisomy 21 in umbilical artery (UA) Doppler findings in the second and third trimester and to correlate those with placental histology. Retrospective analysis of UA pulsatility index (PI) in 281 fetuses with trisomy 21. Cases were divided into isolated trisomy 21 (group I, n = 148, 52.7 %)(More)
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