Sonographic, cytogenetic and DNA analysis in four 69,XXX fetuses diagnosed in the second trimester.

OBJECTIVE

To describe the ultrasound findings and its relationship with the cytogenetic study and the origin of the extra haploid chromosome set in four 69,XXX cases.

METHODS

Four pregnant women were referred because of abnormal 2nd trimester ultrasound. Karytoypes, FISH and DNA analysis were performed.

RESULTS

All cases presented asymmetrical intrauterine growth retardation, marked oligohydramnios and placental alterations and showed a 69,XXX karyotype. In three cases, DNA analysis allowed to establish the origin of the extra haploid chromosome set.

CONCLUSIONS

At least three fetuses had a maternal extra haploid chromosome set. Thus, it has been possible to establish the main ultrasonographic markers and to observe the survival of the fetus until the second trimester when they have a maternal origin.