Sinonasal Inverted Papilloma: A Narrative Review.

Inverted papilloma (IP) is a relatively rare sinonasal benign lesion, peculiar in its etiology, clinical presentation and treatment. Its resemblance to other sinonasal pathologies and varied approaches, makes it an interesting disease. Recently there have been several advances in the management of IP. This article aims to summarize the contemporary developments thus enabling the readers to understand the years of research behind IP. To integrate the available literature on IP and study the current scenario in its management. A comprehensive literature review was done on Google Scholar and PubMed database using the following key words: "inverted papilloma", "Schneiderian", "sinonasal", "medial maxillectomy". Articles published in English were used. Articles published till May 2020 were reviewed. Years of research have aimed to gain more information regarding the epidemiology, histopathology, staging systems and surgical management of IP. To briefly summarize the research so far, it is safe to say that there exists an association between Human Papilloma Virus and IP. The Krouse staging system is the most commonly used. The treatment itself has changed from a conservative approach to a more aggressive excision with or without external approach and with or without chemoradiotherapy. In IP, whether or not associated with SCC, complete surgical removal of the tumour is advocated as the treatment of choice. With the advancements in endoscopic technique, surgeons have been using it to their advantage for the surgical evaluation and cure of IP, depending upon the stage. Endoscopic treatment is preferred, whereas for lesions less accessible endoscopically, or in those with peripheral extension, open surgery is indicated. Every patient requires counselling before discharge and thorough examination during the follow-up to detect any evidence of recurrence.