swelling in my ureter..

i have severe swelling in my ureter, my urologist told me that its coz of small ureter hole which causes pressure on it so its swells..he refers cystoscopy to look inside for the detailed view..i also got 2 big kidney stones(1cm &5cm)..but he told me to leave that for later..its complex..firstly he want to deal with my ureter swelling..