| Characteristics | Stone location | |
| Kidney (n et % patients) | Ureter (n et % patients) | |
| Unilateral and obstructive | 14 (60.9) | 14 (40) |
| Unilateral and non-obstructive | 0 | 13 (37.1) |
| Bilateral and obstructive | 7 (30.4) | 8 (22.9) |
| Bilateral and non-obstructive | 0 | 0 |
| Non specified | 2 (8.7) | 0 |
| Total number of patients | 23 (100) | 35 (100) |