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  • Title: Apparent confined placental mosaicism of trisomy 16 and multiple fetal anomalies: case report.
    Author: Johnson P, Duncan K, Blunt S, Bell G, Ali Z, Cox P, Moore GE.
    Journal: Prenat Diagn; 2000 May; 20(5):417-21. PubMed ID: 10820412.
    Abstract:
    Trisomy 16 is frequently found confined to the placenta (confined placental mosaicism (CPM)), with a structurally normal fetus. In some cases of trisomy 16, the fetus has uniparental disomy for chromosome 16 (UPD16) which is associated with intrauterine growth restriction (IUGR) and fetal anomalies. We report a case of apparent confined placental mosaicism for trisomy 16, using standard cytogenetic techniques, but with multiple fetal abnormalities including congenital diaphragmatic hernia in which there was no evidence of UPD in the disomic tissues examined. Subsequent examination of fetal tissues using fluorescent in situ hybridization (FISH) demonstrated low levels of mosaicism for trisomy 16 in all the tissues examined. The use of FISH permits identification of mosaicism which conventional techniques may not identify.
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