Figure 2. Case 1: (a) ⁹⁹Tc^m-MAG3 renogram 4 days post CT angiogram. The right kidney appears to be absent, no tracer uptake can be identified in the right kidney. (b) Follow up renogram 2 days later, shows a poorly perfused right kidney with prolonged nephrogenic phase of activity. (c) ⁹⁹Tc^m-MAG3 renogram 6 weeks later following ureteric stent placement shows good perfusion, significant recovery of function and rapid excretion of tracer.