NCIt synonyms : Inverted Papilloma of Ethmoid Sinus; Inverted Papilloma of the Ethmoid Sinus; Ethmoid Sinus Inverted Schneiderian Papilloma;
NCIt definition : A benign neoplasm that arises from the ciliated respiratory mucosa that lines the
ethmoid sinus. It results from the invagination and proliferation of epithelial cells
in the underlying stroma.;