title: Pneumatocele of the orbit.
abstract: OBJECTIVE
  To describe an uncommon sinus condition that can cause proptosis.
  
  
  METHODS
  Intermittent unilateral proptosis and diplopia developed in a 29-year-old man. Computed tomography showed an enlarged frontal sinus with erosion of the floor of the sinus and air in the orbit.
  
  
  RESULTS
  Endoscopic ethmoidectomy and frontal sinusotomy corrected an outlet check valve of the nasal frontal duct and eliminated the proptosis.
  
  
  CONCLUSIONS
  Pneumatocele of the orbit is an uncommon cause of proptosis and diplopia and can be corrected with endoscopic sinus surgery.
authors: Department of Ophthalmology, University Hospitals of Cleveland, Ohio, USA.
authors: S S
authors: SS
authors: Purohit
authors: M R
authors: MR
authors: Levine
mesh_terms: D000328:Adult; D004172:Diplopia / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D004646:Emphysema / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D004724:Endoscopy; D005005:Ethmoid Sinus / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D005094:Exophthalmos / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D005500:Follow-Up Studies; D005626:Frontal Sinus / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D013508:Ophthalmologic Surgical Procedures / Q000379:methods; D009916:Orbital Diseases / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D014057:Tomography, X-Ray Computed