Sentinel loop

A sentinel loop is a sign seen on a radiograph that indicates localized ileus from nearby inflammation. Simply put, it is the dilatation of a segment of small intestine. to be differentiated from colonic cutoff sign which is a dilatation of a segment of large bowel. A sentinel loop is a sign seen on a radiograph that indicates localized ileus from nearby inflammation. Simply put, it is the dilatation of a segment of small intestine. to be differentiated from colonic cutoff sign which is a dilatation of a segment of large bowel.