double bubble sign
Radiographic finding showing two gas-filled structures representing duodenal obstruction, classically associated with duodenal atresia.
Full Definition
A pathognomonic radiographic sign consisting of two distinct gas-filled structures: the stomach and the proximal duodenum proximal to the point of obstruction. This finding is most commonly associated with duodenal atresia but can also be seen with other causes of duodenal obstruction including annular pancreas, malrotation with volvulus, or duodenal stenosis. The sign appears on plain abdominal radiographs as two rounded lucencies, often described as soap bubbles. In complete duodenal atresia, minimal or no gas is present distal to the obstruction. Associated findings may include polyhydramnios on prenatal imaging.
Usage
Usage note: Always hyphenate when used as a compound modifier; distinguish from other bubble signs.
In Context
- "The abdominal radiograph demonstrated the classic double bubble sign consistent with duodenal obstruction." — Neonatal radiology report
- "Prenatal ultrasound showed polyhydramnios and the fetal double bubble sign suggesting duodenal atresia." — Prenatal imaging report