| Nonvisible stones | Upper Ureteric Stone | Mid-Ureteric Stone | Lower Ureteric Stone |
|
| IV contrast injection | 67 (38.1%) | 52 (29.5%) | 57 (32.4%) | 176 (100%) |
| Contrast injection through the ureteric catheter | 5 (13.5%) | 2 (5.4%) | 30 (81.1%) | 37 (100%) |
| Passage of Ureteric Catheter only | 8 (22.9%) | 7 (20%) | 20 (57.1%) | 35 (100%) |
| Failed | 6 (30%) | 5 (25%) | 9 (45%) | 20 (100%) |
| Total | 86 (53.2%) | 66 (20.7%) | 116 (26.1%) | 268 (100%) |