Radiologic sign
![An X-ray image of the intestines, showing coiled loops that are darker on the left and right sides and lighter in the middle](../I/m/Double_wall_sign.jpg)
The dark areas on both sides of the intestines indicate that air is present in both sides. This is called "Rigler's 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 (for example, via an X-ray, CT scan, MRI scan, or sonographic scan).
Examples
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