Radiologic sign
Appearance
![An X-ray image of the intestines, showing coiled loops that are darker on the left and right sides and lighter in the middle](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Double_wall_sign.jpg/220px-Double_wall_sign.jpg)
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 (for example, via an X-ray, CT scan, MRI scan, or sonographic scan).