| Radiological type | Number of cases | Percentage (%) |
| I a | 9 | 15 |
| I b | 0 | 0 |
| II | 39 | 65 |
| III | 9 | 15 |
| IV a | 2 | 3 |
| IV b | 1 | 2 |
| Total | 60 | 100 |