<prompt> Double bubble sign is seen in:-Duodenal AtresiaJejunal atresiaIleal atresiaHypertrophic pyloric stenosis  <response>: Ans. a Duodenal AtresiaRef.: SRB manual of Surgery, 4th ed. 1280 The diagnosis of duodenal atresia on X ray abdomen shows two large air filled spaces, called double bubble sign. The air is trapped in the stomach and proximal duodenum, which are separated by the pyloric sphincter, creating the appearance of two bubbles visible on x-ray. Since the closure of the duodenum is complete in duodenal atresia, no air is seen in the distal duodenum. 