In this procedure, the providers inserts an endoscope through an incision in the skin over the kidney or the renal pelvis to analyze the kidney and ureter, and he takes a tissue sample of the kidney for biopsy. He may perform this procedure with irrigation or instillation of saline to better view the structure. He may also perform ureteropyelography or radiological examination of the ureter and renal pelvis by injection of contrast.
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