title: Removal of frontal sinus keratoma solely via endoscopic sinus surgery.
abstract: OBJECTIVE
  To present a patient with a frontal sinus keratoma removed solely via endoscopic sinus surgery, including presentation of characteristic computed tomography and magnetic resonance images; to discuss the differential diagnosis of this condition; and to report the current knowledge on and treatment of frontal sinus keratoma.
  
  
  METHODS
  A 53-year-old man presented to our department with a 10-month history of rhinorrhoea and postnasal drip. After computed tomography and magnetic resonance imaging studies, the patient underwent surgery utilising a modified Lothrop procedure. An extensive soft tissue lesion was removed from the frontal sinus. Histological examination revealed a lamellated cluster of keratinous material. The pathological diagnosis was keratoma of the frontal sinus. There was no recurrence of keratoma over a two-year follow-up period.
  
  
  CONCLUSIONS
  Following review of the English language literature, we believe this case report to represent the first successful application of a modified endoscopic Lothrop procedure for resection of an extensive frontal sinus keratoma. Thus, the applications of endoscopic sinus surgery may be expanded to include frontal sinus keratoma removal.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, Changhua Christian Hospital, Changhua, Taiwan.
authors.forename: J-C
authors.initials: JC
authors.lastname: Lai
authors.forename: C-K
authors.initials: CK
authors.lastname: Liu
authors.forename: M-L
authors.initials: ML
authors.lastname: Chen
authors.forename: M-K
authors.initials: MK
authors.lastname: Chen
mesh_terms: D003937:Diagnosis, Differential; D004724:Endoscopy / Q000379:methods; D005626:Frontal Sinus; D015522:Frontal Sinusitis / Q000175:diagnosis / Q000601:surgery; D006801:Humans; D007642:Keratosis / Q000175:diagnosis / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009298:Nasal Polyps / Q000175:diagnosis / Q000601:surgery; D000857:Olfaction Disorders / Q000209:etiology; D010254:Paranasal Sinus Diseases / Q000175:diagnosis / Q000601:surgery*; D035583:Rare Diseases; D014057:Tomography, X-Ray Computed