Localizing stones

Sometimes stones can be difficult to locate on the day of a lithotripsy. Sometimes this means the stone has passed but othertimes the stone is obscured by overlying bowel contents. Still other stones can look like phleboliths, which are calcifications in veins and of no other significance.
When it becomes difficult to locate a stone, we can use contrast and fluoroscopy, as in the image above.
The stone is in the crosshairs and about to be blasted.
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