To describe ultrasound characteristics and results of the amniocentesis analysis to predict pregnancy outcomes in cases of Hygroma Kystique. Materials and methods: A cohort study of 200 fetuses have prenatal consultation with the diagnosis of Hygroma Kystique at the Prenatal Diagnosis Center of the National Hospital of Obstetrics and Gynecology from 01/2021 to 07/2022. Results: 82% of cases were diagnosed in the first trimester, and 18% in the early second trimester: Median gestation at diagnosis is12,8 ± 1,5 weeks ( 11 – 22.5mm). The average nuchal thickness was 8,4 ± 3,3 mm (3 mm- 26,8mm). The increase of the nuchal thickness leads to the risk of abnormalities, especially with hydrops fetalis (nuchal thickness ≥ 10mm, the rate of hydrops fetalis was 78%; chromosomal abnormalities was 50%).The results of abnormal chromosomes were 31,8%, The most common aneuploidy was Tuner syndrome, Down syndrome, or structural abnormalities such as DiGeorge syndrome.Morphological abnormalities in chromosomal normal cases were 23.7%, of which mainly cardiac abnormalities (50%).Survival was 5% in the study group. Postpartum survivors had normal chromosomal findings and no associated morphological abnormalities.Conclusion: Hygroma Kystiquecan be diagnosed early in the first trimester of pregnancy, often accompanied by a variety of morphological abnormalities, mainly hydrops fetalis. Nuchal thickness is related to abnormal number and chromosomal abnormalities. In addition to the abnormal number of chromosomes, there may also be an abnormality in the structure of the chromosomes. The prognosis of pregnancy is good in cases where there are no associated abnormalities and normal chromosomes.