Last 3 May 2010, I had cystoscopy bilateral ureteral stenting. Diagnosis was "obstructive uropathy secondary to ureteral compression secondary to matted limpadenopathy". Before putting the ureter stents, my creatinine level was 3.7 mg/dl. Three weeks after putting ureter stents, creatinine level was 3.43 mg/dl. What could be the possible reasons for the slow rate of creatinine level going back to normal?