Table I. Site and aetiology of leak.
| Site of leak | Traumatic | Iatrogenic | Spontaneous | No. patients |
| Anterior ethmoid | 6 | 12 | 8 | 26 |
| Posterior ethmoid | 2 | 4 | 3 | 9 |
| Sphenoid | 5 | 5 | 2 | 12 |
| Multiple | 3 | 2 | 0 | 5 |
| Total | 16 | 23 | 13 | 52 |
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