Atypical Presentations of Sinonasal Inverted Papilloma: Surgical Management and Influence on the Recurrence Rate:

BackgroundSinonasal inverted papilloma (SNIP), classically, is a unilateral benign tumor of the nasal lateral wall. Numerous variations have been observed, depending on location, bilateral presentation, or association with nasal polyposis.ObjectiveThe aim of this work was to describe atypical presentations of SNIPs with their management specificities and to assess their influence on the recurrence rate in a large case series.MethodsA retrospective single center study of 110 patients treated for SNIP. Atypical inverted papillomas were identified according to the following criteria: (1) unusual location (frontal, posterior, anterior), (2) bilateral involvement, and (3) association with nasal polyposis. Surgical management was detailed, and the influence of each atypical group on recurrence was assessed by using Kaplan-Meier survival curves and the log-rank test.ResultsDistribution of atypical presentations was as follows: frontal sinus localization (10.9%); posterior localization, including sphenoid sinus (...