Radiologic sign

A radiologic sign is an objective indication of some medical fact (that is, a medical sign) that is detected by a physician during radiologic examination with medical imaging[1] (for example, via an X-ray, CT scan, MRI scan, or sonographic scan).

The dark areas on both sides of the intestines indicate that air is present in both sides. This is called "Rigler's sign".

Examples

Parker, Mark S.; Chasen, Marvin H.; Paul, Narinder (1 March 2009). "Radiologic Signs in Thoracic Imaging: Case-Based Review and Self-Assessment Module". American Journal of Roentgenology. 192 (3_supplement): S34–S48. doi:10.2214/AJR.07.7081. ISSN 0361-803X. Retrieved 23 April 2019.

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Radiologic signs
Cardiovascular	Aortic unfolding Dense artery sign Halo sign
Respiratory	Air crescent sign Deep sulcus sign Golden S sign Hampton hump Kerley lines Peribronchial cuffing Sail sign of the chest Silhouette sign Steeple sign Thumbprint sign Traction bronchiectasis Tree-in-bud sign Westermark sign
Urogenital	Canga's bead symptom
Musculoskeletal	Crescent sign Fabella sign Fat pad sign/Sail sign of the elbow Osteopathia striata
Gastrointestinal	Cupola sign Double bubble Endoexoenteric Football sign Hampton's line Hot quadrate sign Mumoli's sign Omental cake Pneumatosis intestinalis Rigler's sign Sentinel loop
Neurological	Hyperdense middle cerebral artery