<unk>  is a condition consisting of abnormal expansion or dilatation of one or more paranasal sinuses. It most often affects the frontal sinus, and can cause damage to vision due to pressure on the nearby optic nerve. The preferred treatment is endoscopic surgery to deflate the sinus.
Pneumosinus dilatans
Peritonsillar abscess
Bronchocele
Epiglottitis
Adenoiditis
Retropharyngeal abscess
Globus pharyngis
Parapharyngeal abscess