title: Pneumocele--a rare cause of air in the orbit.
abstract: OBJECTIVE
  To report a case of unilateral proptosis and chronic pansinusitis in which the diagnosis of pneumocele was made.
  
  
  METHODS
  Observational case report.
  
  
  METHODS
  A retrospective chart review was made.
  
  
  RESULTS
  A 52-year-old man with chronic pansinusitis presented with a 5-mm proptosis and a larger palpebral fissure in the left eye. Computed tomography imaging demonstrated an air-filled mass originating from the frontal sinus and protruding into the orbit. After endoscopic sinusotomy and excision of the mucosal sac through anterior orbitotomy, proptosis improved to 3 mm and palpebral fissures became symmetric.
  
  
  CONCLUSIONS
  A pneumocele is a rare lesion of the paranasal sinuses that may expand into the orbit and may present with proptosis or motility deficit to the ophthalmologist. Through proper diagnosis and surgical management, the orbital symptoms will resolve.
authors.affiliation: Department of Ophthalmology, Maisonneuve-Rosemont Hospital, University of Montreal Medical School, Montreal, Quebec, Canada.
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Boulos
authors.forename: C Robert
authors.initials: CR
authors.lastname: Bernardino
authors.forename: Peter A D
authors.initials: PA
authors.lastname: Rubin
mesh_terms: D000388:Air; D004646:Emphysema / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D005094:Exophthalmos / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009916:Orbital Diseases / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D010254:Paranasal Sinus Diseases / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D012189:Retrospective Studies; D012852:Sinusitis / Q000209:etiology; D014057:Tomography, X-Ray Computed