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  • Title: Trisomy 2: confined placental mosaicism in a fetus with intrauterine growth retardation.
    Author: Ariel I, Lerer I, Yagel S, Cohen R, Ben-Neriah Z, Abeliovich D.
    Journal: Prenat Diagn; 1997 Feb; 17(2):180-3. PubMed ID: 9061769.
    Abstract:
    In a pregnancy that was monitored due to increased risk for Down syndrome in the triple test, a normal karyotype was found in amniocentesis. Follow-up by serial ultrasound examinations revealed intrauterine growth retardation (IUGR) at 20 weeks of gestation. The parents decided to terminate the pregnancy and the karyotype of the placental fibroblasts was 47,XX,+2. Analysis of polymorphic markers of chromosome 2 demonstrated (a) that trisomy 2 was confined to the placenta (CPM), (b) that the trisomy 2 cell line was a result of a meiotic I error of paternal origin, and (c) that the fetal tissues with a normal karyotype were biparental disomy 2.
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