There has been progressive decline in the size of the right kidney, consistent with chronic failure. The degree of retroperitoneal fibrosis is essentially stable. Also note the presence of a left nephrostomy tube, possibly accounting for why the left kidney remains normal in size.
What is the differential diagnosis given these findings and what other findings would you look for to further differentiate them?
For a larger image, please click Renal Insufficiency 8 .
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