CONCLUSION
The prevalence of HPV detected in inverted papilloma in our patients is 34%. Our results support that HPV infection is an aetiological factor in sinonasal inverted papilloma. A high detection rate of a high-risk HPV type (67%) was observed in patients with inverted papilloma with malignant transformation. A high-risk HPV plays a role in the oncogenesis of sinonasal inverted papilloma. Further studies should be conducted to further elaborate this relationship.