Fetal cystic hygroma in the first trimester led to diagnosis of partial trisomy 22.

Partial trisomy 22 is a rare condition that is found in live birth. In most cases, diagnosis of partial trisomy 22 was made after birth. Herein, we report a prenatal diagnosis of fetal partial trisomy 22 in a 28-year-old pregnant woman presented with fetal cystic hygroma. Structural abnormalities were detected at 16 weeks of gestation: left cleft lip and ventricular septal defect. The G-banding karyotype analysis and fluorescence in situ hybridization showed partial trisomy 22. It is recommended that pregnant women with fetal anomalies should have prenatal genetic diagnosis to ascertain whether the fetus has partial trisomy 22 or other rare chromosomal abnormalities.