Fig. 12. Duodenal atresia in a second trimester fetus. A: Ultrasound scan of fetal abdomen (arrowheads) showing two fluid-filled structures (arrows). Increased amniotic fluid (polyhydramnios) surrounds the fetus. B: Newborn radiograph of upper abdomen demonstrating gas-filled stomach (S) and duodenum (D), which are typical findings of duodenal atresia. (Courtesy of Alfred B. Kurtz, MD)