title: Thin-section CT findings of arc-welders' pneumoconiosis.
abstract: OBJECTIVE
  To describe the thin-section CT findings of arc-welders' pneumoconiosis.
  
  
  METHODS
  Eighty-five arc-welders with a three to 30 (mean, 15)- year history of exposure underwent thin-section CT scanning. The extent of abnormalities detected was correlated with the severity of dyspnea and pulmonary function tests. For comparison, images of 43 smoking males (mean 25 pack-year) who underwent thin-section CT for other reasons (smokers' group) were also analyzed.
  
  
  RESULTS
  Fifty-four welders (63.5%) and six smokers (14.0%) showed positive findings. Predominant thin-section CT findings were poorly-defined centrilobular micronodules (30/54, 55.6%), branching linear structure (18/54, 33.3%), and ground-glass attenuation (6/54, 11.1%). In the smokers' group, poorly-defined micronodules were found in four patients, branching linear structures in one, and ground-glass attenuation in one. In welders, the extent of abnormalities seen on thin-section CT showed no significant correlation with the severity of dyspnea or the results of pulmonary function test.
  
  
  CONCLUSIONS
  Poorly-defined centrilobular micronodules and branching linear structures were the thin-section CT findings most frequently seen in patients with arc-welders' pneumoconiosis. Less commonly, extensive ground-glass attenuation was also seen.
authors.affiliation: Department of Radiology and the Institute of Radiation Medicine, MRC, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: D
authors.initials: D
authors.lastname: Han
authors.forename: J M
authors.initials: JM
authors.lastname: Goo
authors.forename: J G
authors.initials: JG
authors.lastname: Im
authors.forename: K S
authors.initials: KS
authors.lastname: Lee
authors.forename: D M
authors.initials: DM
authors.lastname: Paek
authors.forename: S H
authors.initials: SH
authors.lastname: Park
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005290:Ferric Compounds; D006801:Humans; D008297:Male; D011009:Pneumoconiosis / Q000000981:diagnostic imaging* / Q000209:etiology; D012907:Smoking / Q000009:adverse effects; D014057:Tomography, X-Ray Computed; D014896:Welding
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide