Key points:
1. Post-operative fever after cortical mastoidectomy due to complicated acute mastoiditis may be a benign sign in duration of 5-6 days post operatively.
2. In cases of multiple acute mastoiditis complications, higher and prolonged fever is more likely, compared to single complication cases.
3. S. pneumoniae is the common pathogen in patients with single acute mastoiditis complication, while F. necrophorum is associated with multiple complications.