I have done my ultrasound and CT scan in jan 2021 at that time there was 2 stone in my right
kidney 5mm and 4mm and all organs was fine, after 6 months I did my usg, in that it was showing mild hydronephrosis in right kidney with 5.1 stone in right kidney , now 10 days ago I did my USG, in that showing Grade 1 hydronephrosis and hydroureter in the left kidney and not any stone present. So what can be the reason earlier I was stone in right kidney how my left kidney got hydronephrosis and hydroureter. And is there any need to do twice CT scan in 1 year only.