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The study analyzed the occurrence of malignant transformation in patients treated for sinonasal inverted papilloma (SNIP) and factors contributing to recurrence. The retrospective review of the medical records of 296 patients showed a low rate (0.7%) of sinonasal cancer development in patients primarily diagnosed with benign SNIP. The most common non-sinonasal cancer sites were similar to those reported for the Finnish population, and no patients presented with an HPV-associated non-sinonasal malignancy. Attachment-oriented surgery and endoscopic resection were found to have a lower recurrence rate than other approaches, and dysplasia in SNIP was associated with a higher recurrence rate. Overall, the study suggests that malignant transformation of SNIP is rare, and the total number of SNIP recurrences has decreased with the predominant use of endoscopic resection and attachment-oriented surgery.
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