3 - Nonsquamous Lesions of the Nasal Cavity, Paranasal Sinuses, and Nasopharynx

Abstract

The nasal cavities, paranasal sinuses, and nasopharynx form the top of the upper respiratory tract and are located immediately beneath the base of the cranium, in close relationship with vital structures. This complex anatomic region is very much exposed to airborne agents and hosts a variety of often rare inflammatory and neoplastic conditions, which represent a diagnostic challenge for the surgical pathologist.