In case of a ureteric blockade (due to stone formation for instance) it is the treatment of choice to insert a stent
and remove the stone either by breaking it or removing it directly. stents are left there to keep the ureters patents. whenever there is a blockade it is usual for the kidneys to develop hydronephrosis
. I would need to know the exact cause of the blockade to comment any further. Assuming it was a stone, what type of stone was it? there are ways and medicines to prevent this from happening again. if you son had the same problem as he had in india, than that need to be fixed. for now i suggest you follow his condition very closely and monitor the situation with hydronephrosis. if you have any questions, please feel free to contact me.
take care of yourself and your son.