Figure 2. A 56-year-old female presented with acute right-sided flank pain caused by a right vesicoureteric junction calculus. (a) Axial CT shows evidence of hydronephrosis with but no evidence of significant stranding. (b) Axial MR, shows significant perirenal fluid (arrows). (c) MR urogram shows a dilated ureter to the level of the bladder. Gallbladder (G).