title: Optic neuropathy produced by a compressed mucocele in an Onodi cell.
abstract: OBJECTIVE
  To describe a patient with compressive optic neuropathy caused by a mucocele in an Onodi cell.
  
  
  METHODS
  Interventional case report.
  
  
  METHODS
  A 73-year-old man complained of sudden visual loss in the left eye 10 days after cataract surgery. Coronal computed tomography showed a homogeneous mass in an Onodi cell. Magnetic resonance imaging revealed an oval-shaped lesion that compressed the left optic nerve.
  
  
  RESULTS
  After endoscopic microsurgery of the paranasal sinus, visual acuity in the left eye improved. Histopathological examination of the excised specimen showed a mucocele.
  
  
  CONCLUSIONS
  Ophthalmologists should be aware that the mucocele in the Onodi cell, an anatomical variation of the paranasal sinus, may compress the optic nerve.
authors.affiliation: Department of Ophthalmology, Toyama Medical and Pharmaceutical University, Sugitani, Toyama, Japan. ophthal@ms.toyama-mpu.ac.jp
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Kitagawa
authors.forename: Seiji
authors.initials: S
authors.lastname: Hayasaka
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Shimizu
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Nagaki
mesh_terms: D000368:Aged; D004724:Endoscopy; D005005:Ethmoid Sinus / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009078:Mucocele / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D009408:Nerve Compression Syndromes / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D009901:Optic Nerve Diseases / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D010254:Paranasal Sinus Diseases / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D013101:Sphenoid Sinus / Q000473:pathology*; D014057:Tomography, X-Ray Computed