Rigler's sign, also known as the double wall sign, is a radiologic sign seen on an x-ray of the abdomen when air is present on both sides of the intestine; a Rigler's sign is present when air is present on the inside (luminal side) and the outside (peritoneal side). Air in the peritoneum is considered abnormal, unless the patient had a recent abdominal surgery.
Double wall sign. This is a secondary sign of pneumoperitoneum
. Patient is supine, and air within the abdomen and lumen of the bowel accentuate both sides of the bowel wall.
A false double wall sign can result from two loops of bowel being in contact with one another.
The sign is named after Leo George Rigler. It is not the same as Rigler's triad.
- ↑ de Lacey G, Bloomberg T, Wignall BK. Pneumoperitoneum: the misleading double wall sign. Clin Radiol. 1977 Jul;28(4):445-8. PMID 872511.