Mucocele Benign neoplasms: Obstruction of sinus ostia and accumulation of fluid Etiology: chronic inflammation, allergic sinonasal disease, trauma, and previous surgery anthology: retention of intrasinus secretion, progressive augmentation of internal pression, bony remodeling and erosionMucocele Benign neoplasms: Obstruction of sinus ostia and accumulation of fluid Etiology: chronic inflammation, allergic sinonasal disease, trauma, and previous surgery Pathology：retention of intrasinus secretion, progressive augmentation of internal pression, bony remodeling and erosion