PRENATAL-DIAGNOSIS OF TRISOMY-9 - 6 CASES AND A REVIEW OF THE LITERATURE

Six prenatally diagnosed cases of trisomy 9 are reported and 22 previo usly reported cases are reviewed; the difficulty of genetic counsellin g for such cases and the variation in the percentage of trisomic cells in different tissues, thus making accurate diagnosis of trisomy 9 dif ficult, are emphasized. In addition to karyotyping results, ultrasound findings are important in achieving diagnoses. Finally, a course of a ction when prenatal trisomy 9 is detected is proposed.