Diagnóstico prenatal de atresia duodenal en feto con Síndrome Down. A propósito de un caso

Duodenal atresia (AD) is a rare congenital pathology. It is the result of a failure in the recanalization of the duodenum and can be found associated with chromosomopathies such as Down syndrome in 30% of cases. Down syndrome is caused by a trisomy of the 21 chromosome pair and is the most frequent chromosomal aberration. Due to the need to have reports of this alteration, we present the prenatal diagnosis by ultrasound and a cytogenetic study of a 25-year-old patient who, at 28 weeks pregnancy, had a dual echolucent image below the fetal abdomen under the stomach (double bubble image) compatible with duodenal atresia. On the bases of the suspicion of the association type of malformation with chromosomal disease, a prenatal cytogenetic diagnosis was performed, resulting: 47, XX, +21, inv (9) (p11; q12), female fetus positive for trisomy 21 and pericentric inversion of chromosome 9. After genetic counseling, the couple opted for the exceptional pregnancy interruption. The presence of duodenal atresia and dysmorphic features compatible with down syndrome were confirmed by pathological anatomy.