[Unexpected chromosomal abnormalities in prenatal diagnosis. 4 case reports with preservation of the pregnancy].

Four unexpected karyotypes were found in prenatal diagnosis: 47,XXX; 47,XXY; double reciprocal translocation; Yq-. Supplementary biological studies (including specific Y-DNA probes) are carried out in order to help in the parents' decision. No induced abortion was performed. The children are described after delivery.