Sinonasal (Schneiderian) papilloma is a benign infiltrative epithelial neoplasm arising from ectodermal derived pseudostratified ciliated epithelium which covers the nasal cavity and sinonasal tract. What is the Pathology of Sinonasal (Schneiderian) Papilloma? The pathology of sinonasal (Schneiderian) papilloma is:  -Etiology:…