The dark areas on both sides of the intestines indicate that air is present in both sides. This is called "Rigler's sign". A<unk>  is an objective indication of some medical fact (that is, a medical sign) that is detected by a physician during<unk>  examination with medical imaging (for example, via an X-ray, CT scan, MRI scan, or sonographic scan).
Radiologic sign
Functional symptom
Tile classification
Radiographic classification of osteoarthritis
Signs and symptoms
Antimicrobial spectrum
EConsult
Vancouver classification