Trisomy 8 mosaicism in the placenta: A Danish cohort study of 37 cases and a literature review

Simon Horsholt Thomsen*, Ida Charlotte Bay Lund, Christina Fagerberg, Iben Bache, Naja Becher, Ida Vogel

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Objective: To evaluate the risk of fetal involvement when trisomy 8 mosaicism (T8M) is detected in chorionic villus samples (CVS). Methods: A retrospective descriptive study of registered pregnancies in Denmark with T8M in CVS identified through a database search and a review of published cases of T8M found through a systematic literature search and inclusion of cross references. Pregnancies with T8M in CVS and no additional numerical chromosomal aberrations were included. Results: A total of 37 Danish cases and 60 published cases were included. T8M detected in a CVS was associated with fetal involvement in 18 out of 97 pregnancies (18.6% [95%CI: 11.4–27.7]). Eight out of 70 (11.4% [95%CI: 5.1–21.3]) interpreted prenatally to be confined placental mosaicism (CPM) were subsequently found to be true fetal mosaicisms (TFM). Conclusion: T8M detected in CVS poses a significant risk of fetal involvement, and examination of amniotic fluid (AF) and/or fetal tissue should be offered. However, a normal result of AF still has a considerable residual risk of fetal involvement. Genetic counselling at an early gestational age is essential, and follow-up ultrasonography should be performed to predict fetal involvement if possible.

Original languageEnglish
JournalPrenatal Diagnosis
Issue number4
Pages (from-to)409-421
Publication statusPublished - Mar 2021

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