Figure 5b. Meconium ileus. (a) Abdominal scout radiograph shows marked distention of the small bowel and a "soap bubble" appearance in the right side of the abdomen (arrows), a finding suggestive of mottled air and feces. (b) US image shows dilated, fluid-filled intestinal loops containing echogenic material (calcified meconium) (arrows). Associated ileal atresia was seen at surgery. (c) Gross specimen shows marked distention of the small bowel loops.