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The drainage tube of urine starts from each kidney. Its proximal end is like a receptacle called pelvis, which is âusually inside the kidney and tapers to form the ureter - a long tube which takes urine to the bladder.â
Any obstruction due to scarring of the renal pelvis or the ureter, can result in obstruction of urine and this is called âas hydronephrosis. âIf this pressure on the kidneys persists, then it results in progressive and irreversible loss of the renal function.
What your doctors are suggesting are for placement of stents within the urinary tract, which will remove the obstruction within the urinary tract and preventing further damage and loss of renal function. Hence you should take their advice and continue with the proposed form of treatment.
Once the obstructive lesion within the ureter is cleared, and the free flow of urine is established, there should be no reason for the pain to persist. Hence you should not worry about the current pain which is mostly transient and would last only for a few days after the procedure, but the long term outcome will be very good for you.
I hope this helps.