title: Bronchial diverticula detected by multidetector-row computed tomography: incidence and clinical features.
abstract: OBJECTIVE
  Our aim was to investigate the incidence and characteristics of bronchial diverticula using multidetector-row computed tomography (MDCT) and to evaluate their association with smoking status.
  
  
  METHODS
  Two radiologists retrospectively reviewed MDCT scans obtained between December 2007 and February 2008 with a 4-row or a 64-row MDCT scanner for 1122 consecutive patients. Bronchial diverticula were assessed for incidence, locations, and sizes. Smoking history, including the Brinkman Index, was recorded from clinical records. Statistical analysis used χ or t tests to evaluate associations between patients' clinical information (age, sex, or smoking history) and the presence of bronchial diverticula.
  
  
  RESULTS
  A total of 401 bronchial diverticula were found in 242 (21.6%) patients (mean, 1.65; mode, 1 per patient). Most diverticula were 1 or 2 mm in size. Bronchial diverticula were most frequently detected in the subcarinal region. Of these 242 patients with diverticula, 142 (58.7%) were male and had a higher prevalence than women (P<0.01). No significant difference in age was found between the groups with and without bronchial diverticula. Although bronchial diverticula were also observed in lifelong nonsmokers, the group with bronchial diverticula had a higher percentage of smokers than the group without bronchial diverticula (P=0.01). The Brinkman Index for the group with bronchial diverticula was significantly higher than for the group without diverticula (P<0.01).
  
  
  CONCLUSIONS
  Bronchial diverticula are frequently observed on chest MDCT scans and are associated with cigarette smoking.
authors.affiliation: Department of Radiology, University of the Ryukyus, Nishihara-cho, Okinawa, Japan. mchutesu@yahoo.co.jp
authors.forename: Tetsuhiro
authors.initials: T
authors.lastname: Miyara
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Oshiro
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Yamashiro
authors.forename: Hisashi
authors.initials: H
authors.lastname: Kamiya
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ogawa
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Murayama
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001982:Bronchial Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging*; D004240:Diverticulum / Q000175:diagnosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D012189:Retrospective Studies; D012907:Smoking / Q000009:adverse effects