Deletion of the long arm of chromosome 16 is an uncommon chromosomal aberration. There are no standardized sonographic findings. A routine scanning in a 32-year-old multigravida at 25 weeks’ gestation showed polyhydramnios. Detailed anomaly scanning further demonstrated cleft lip, ventricular septal defect, overlapping fingers, and rocker-bottom feet. Fetal karyotyping documented interstitial deletion of the long arm of chromosome 16 in all 20 analyzed metaphases, and trisomy 18 in 12 metaphases: 46,XY,del(16)(q12.1q13)[8]/47,XY,del(16)(q12.1q13),+18[12].
The authors have experienced a case of prenatal diagnosis of interstitial deletion of chromosome 16(q12.1q13) and mosaic trisomy 18. Thus, we report our case with a brief review of literatures.