Objective: We present prenatal diagnosis of mosaic trisomy 16 by amniocentesis in a pregnancy associated with an abnormal first-trimester screening result, intrauterine growth restriction (IUGR) and a favorable outcome.
Case Report: A 27-year-old woman underwent amniocentesis at 18 weeks of gestation because of an abnormal first-trimester screening result with maternal serum free β-hCG of 1.474 multiples of the median (MoM), pregnancy associated plasma protein-A (PAPP-A) of 0.122 MoM and placental growth factor (PlGF) of 0.101 MoM, and a Down syndrome risk of 1/45. Amniocentesis revealed a karyotype of 47,XY,+16 [9]/46,XY [16] and an abnormal array comparative genomic hybridization (aCGH) result of arr (16) × 3 [0.54] compatible with 54% mosaicism for trisomy 16 in uncultured amniocytes. At 24 weeks of gestation, repeat amniocentesis revealed a karyotype of 47,XY,+16 [4]/46,XY [16] and an aCGH result of arr 16p13.3q24.3 (96,766-90,567,357) × 2.25 with a log ratio = 0.2 compatible with 20-30% mosaicism for trisomy 16 in uncultured amniocytes. Quantitative fluorescent polymerase chain reaction (QF-PCR) excluded uniparental disomy (UPD) 16. Interphase fluorescence in situ hybridization (FISH) analysis on uncultured amniocytes revealed 19.4% (12/62 cells) mosaic trisomy 16. Prenatal ultrasound revealed IUGR. At 36 weeks of gestation, a phenotypically normal baby was delivered with a body weight of 1900 g. The cord blood had a karyotype of 46,XY. QF-PCR analysis confirmed biparentally inherited disomy 16 in the cord blood and maternal-origin of trisomy 16 in the placenta. When follow-up at age two months, FISH analysis on 101 buccal mucosal cells and 32 urinary cells revealed no signal of trisomy 16.
Conclusion: Mosaic trisomy 16 at amniocentesis can be associated with IUGR and an abnormal first-trimester screening result with low PAPP-A and low PlGF. Mosaic trisomy 16 without UPD 16 at amniocentesis can have a favorable outcome, and the abnormal triosmy 16 cell line may disappear after birth.
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