Pyloric atresia and Down's syndrome: prenatal double bubble false sign.

Pyloric atresia is a rare malformation, with an incidence of 1:100,000 live newborns. Male to female ratio is 1/1. Typically, it is an isolated malformation, with a good prognosis, but 20-40% of cases present epidermolysis bullosa, and to a lesser extent, multiple intestinal atresias. We present the case of a pre-term newborn prenatally diagnosed with polyhydramnios, duodenal atresia with "double bubble" sign, and suspected Down's syndrome, who eventually had pyloric atresia.