Intravenous pyelography positive for a right ureteral stone

Scout KUB shows a calcification overlying the expected location of the proximal right ureter (A; arrow). Eight-minute film of the kidneys shows delayed right kidney function indicating obstruction (B). Ten-minute KUB confirms the site of obstruction as the proximal right kidney stone (C; dashed arrow); note mild dilation of the right collecting system and proximal ureter compared with the left.