<prompt> Double bubble sign is feature of:Annular pancreasDuodenal atresiaDuodenal diaphragmALL of the above  <response>: Ans. d All of the above. Ref. Graingers Diagnostic Radiology, 4th ed., 1205, 1212 Radiological appearanceDisease1Single bubble with paucity of gaseous shadowCHPS2Double-bubble signDuodenal atresiaAnnular pancreasLadds band3Triple bubble signjejunal atresia4Multiple bubbles with microcolonIleal atresiaNote: Ladds band, the abnormal peritoneal bands, passing from the caecum to porta hepatis region, crossing the duodenum are often present in patients with malrotation and may contribute to partial duodenal obstruction but are rarely the sole cause. 