title: New bone formation in unilateral rhinosinusitis.
abstract: BACKGROUND
  Computed tomography (CT) frequently shows abnormal bone thickening in patients with chronic rhinosinusitis. The sinus bone may be not in a static state, and remodeling occurs in response to chronic inflammation.
  
  
  METHODS
  Ostiomeatal unit CT scans were reviewed in 29 patients with unilateral rhinosinusitis (URS) undergoing endoscopic sinus surgery. We defined new bone formation (NBF) as a remarkable bone thickening or hyperostosis of the intrinsic sinus walls in comparison with the normal side. Bony CT scores of sinus walls were expressed by the Hounsfield unit (HU) and soft tissue CT scores were measured by the Lund-Mackay system.
  
  
  RESULTS
  Almost all of the NBF was located at the maxillary and anterior ethmoid sinuses (83.7%), and it was significantly increased in patients with higher Lund-Mackay scores (p = 0.043). The HU values were significantly different between NBF and non-NBF contralateral sides (p < 0.05).
  
  
  CONCLUSIONS
  The HU may be helpful to diagnose and quantify the bone remodeling in URS.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Hanyang University, Seoul, Korea. shcho@hanyang.ac.kr
authors.forename: Seok Hyun
authors.initials: SH
authors.lastname: Cho
authors.forename: Su Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Keun Young
authors.initials: KY
authors.lastname: Lee
authors.forename: Hyun Chang
authors.initials: HC
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015519:Bone Density; D016723:Bone Remodeling; D002908:Chronic Disease; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015576:Hyperostosis / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D010012:Osteogenesis / Q000502:physiology*; D012189:Retrospective Studies; D012220:Rhinitis / Q000150:complications / Q000000981:diagnostic imaging*; D012852:Sinusitis / Q000150:complications / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed