Double bubble sign is a radiographic finding. It is mostly found in adults. It refers to the proximal dilatation of duodenum secondary to obstruction and stomach. The differential diagnoses of double bubble sign are: - Duodenal atresia - Annular pancreas - Duodenal stenosis - Midgut volvulus - Retroperitoneal tumor - Preduodenal portal vein - Choledochal cyst - Mesenteric duplication cyst - Superior mesenteric artery syndrome - Intramural duodenal hematoma Reference: https://radiopaedia.org/articles/double-bubble-sign-duodenum Image via: https://learningradiology.com/notes/ginotes/doublebubblecorrect.html