Keywords: رنوگرافی دیورتیک; kidney; hydronephrosis; congenital; radioisotope renography; diuresis; AUC; area under the curve; C30; clearance at 30 minutes; CH; congenital hydronephrosis; CUP; clearance with patient upright; DR; diuretic renography; MAG-3; 99mTc-mercaptoacetyltriglyc