Figure 3: (a) Scout film: bilateral renal calculi. (b) IVU: a dilated right ureter, but the cause was not apparent. No ureteral calculus on noncontrast CT. (c) Contrast-enhanced CT scan: marked wall thickening in the region of ureteral dilatation (arrow) indicating ureteritis and also an extrinsic vascular compression of the right ureter (between arrowhead and lower white arrow).