Main results
The most common area for IP in our cohort was the maxillary sinus (33%) which is displayed in Table 1. Recurrence was most common in the frontal and maxillary sinuses and the most common procedure performed was a medial maxillectomy (30%).
After 5 years of follow-up, there were a total of 21 recurrences in our cohort (figure 1) – these consisted of 6 recurrences in primary cases and 15 recurrences in secondary cases. When the number of recurrences between primary and secondary cases was compared, the difference was found to be statistically significant (X2(1, n=40)= 19.1583, p = 0.000412). A range of 1-2 episodes of recurrence were seen in each primary case, compared to 1-7 episodes in each secondary case.
On average, recurrence was detected within 20 and 39 months in primary and secondary cases respectively. Most recurrences were treated with local resection (50%) or topical intranasal mitomycin (20%). Regarding complications, there was 1 case of intra-operative CSF leak (repaired intra-operatively) and 1 case of temporary post-operative facial numbness.