The provider uses a pre–existing nephrostomy tract and ultrasound and/or fluoroscopy, imaging technologies that display live images on a video monitor, to guide placement of a ureteral stent, a thin tube placed into a ureter at an area of stricture, or narrowing, to prevent obstruction or to maintain drainage of urine from the kidney. He may also inject contrast material to image the internal structures of the kidney (nephrostogram) and ureter (ureterogram). The procedure includes radiological supervision and interpretation.
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