| Orbital extension | Intracranial extension |
Frontal | 3 out of 7 cases | 1 out of 7 cases |
Fronto-ethmoid | 5 out of 6 cases | 0 |
Ethmoid | 2 out of 3 cases | 0 |
Sphenoid | 0 | 1 out of 4 cases *cavernous sinus thrombosis |
Maxillary | 0 | 0 |