PMC2684293_01
A. Initial CT scan. Note mild fullness of left renal pelvis. B. CT scan one year later. Note marked hydronephrosis of left kidney with thinning of renal parenchyma.
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A 62-year-old woman was referred for a brief episode of left flank pain and imaging demonstrating fullness of the left renal pelvis [Figure 1A]. Repeat imaging demonstrated severe left-sided hydronephrosis [Figure 1B].
A. Initial MAG-3 renal scan. Note prompt bilateral washout after diuretic. B. MAG-3 renal scan one year later. Note delayed washout of tracer from the left kidney after furosemide.
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She was further evaluated with a MAG-3 diuretic renal scan demonstrating symmetric renal function and no evidence of left-sided obstruction (T 1/2 of 6 min) after administration of a diuretic [Figure 2A]. Repeat nuclear renography at that time demonstrated loss of renal function from 50 to 10% [Figure 2B].