label: Sinonasal Human Papillomavirus-Related Multiphenotypic Carcinoma
label_lc: sinonasal human papillomavirus-related multiphenotypic carcinoma
description: "A distinctive HPV-related non-keratinizing squamous cell carcinoma of the sinonasal tract arising most frequently from the maxillary sinus or nasal cavity. Most patients present with nasal obstruction and/or epistaxis. It is characterized by the presence of basaloid cell proliferations separated by collagenous fibrous bands. The basaloid cells align around microcystic spaces."