<prompt> Answer this question truthfullyCould you please explain the meaning of Riglers sign?  <response>: <reason> Riglers sign, also known as the double wall sign, is seen on an x-ray of the abdomen when air is present on both sides of the intestine; a Riglers sign is present when air is present on the inside lumenal side and the outside peritoneal side. Air in the peritoneum is considered abnormal, unless the patient had a recent abdominal surgery.A false double wall sign can result from two loops of bowel being in contact with one another. 