Abstract:Background. Sinonasal inverted (PI) papilloma is a benign tumor of the mucosal epithelium of the nasal cavity and paranasal sinuses with an endophytic growth pattern. PI is more common in men in the fifth and sixth decades of life. These tumors have local aggressive behavior, high recurrence rates, and can undergo malignant transformation. Squamous cell carcinoma (SCC) is the most common malignancy developed from sinonasal PI. SSC developed from PI (KSS/PI) is related to exposure in the work environment.
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