{Reference Type}: Journal Article {Title}: Sine Qua Non: Sinonasal Inverted Papilloma. {Author}: Jewett FC;Coulter MJ;Nelson BL; {Journal}: Head Neck Pathol {Volume}: 15 {Issue}: 3 {Year}: Sep 2021 暂无{DOI}: 10.1007/s12105-021-01289-6 {Abstract}: Inverted papilloma (IP) is a common proliferation of squamous epithelial cells of the sinonasal tract. Although considered benign, IP is known to cause local destruction, has a high rate of recurrence, and a low, but significant rate of malignant transformation. Differentiating an IP from its histologic mimickers is essential for appropriate risk stratification and long-term surveillance. A classic case of sinonasal inverted papilloma is discussed.