[Determination of fetal karyotype in the first trimester of pregnancy by direct examination of chorionic villi]. / Détermination du caryotype foetal au premier trimestre de la grossesse par examen direct des villosités choriales.

Chorionic biopsy during the first trimester of pregnancy allows fast and precise study of fetal karyotype. Considering the results of our ten prenatal diagnoses, we discuss the advantages and the risks of this method.