title: CT Characteristics of Pleural Plaques Related to Occupational or Environmental Asbestos Exposure from South Korean Asbestos Mines.
abstract: OBJECTIVE
  This study evaluated the CT characteristics of pleural plaques in asbestos-exposed individuals and compared occupational versus environmental exposure groups.
  
  
  METHODS
  This study enrolled 181 subjects with occupational exposure and 98 with environmental exposure from chrysotile asbestos mines, who had pleural plaques confirmed by a chest CT. The CT scans were analyzed for morphological characteristics, the number and distribution of pleural plaques and combined pulmonary fibrosis. Furthermore, the CT findings were compared between the occupational and environmental exposure groups.
  
  
  RESULTS
  Concerning the 279 subjects, the pleural plaques were single in 2.2% and unilateral in 3.6%, and showed variable widths (range, 1-20 mm; mean, 5.4 ± 2.7 mm) and lengths (5-310 mm; 72.6 ± 54.8 mm). The chest wall was the most commonly involved (98.6%), with an upper predominance on the ventral side (upper, 77.8% vs. lower, 55.9%, p < 0.001) and a lower predominance on the dorsal side (upper, 74.9% vs. lower, 91.8%, p = 0.02). Diaphragmatic involvement (78.1%) showed a right-side predominance (right, 73.8% vs. left, 55.6%, p < 0.001), whereas mediastinal plaques (42.7%) were more frequent on the left (right, 17.6% vs. left, 39.4%, p < 0.001). The extent and maximum length of plaques, and presence and severity of combined asbestosis, were significantly higher in the occupational exposure group (p < 0.05).
  
  
  CONCLUSIONS
  Pleural plaques in asbestos-exposed individuals are variable in number and size; and show a predominant distribution in the upper ventral and lower dorsal chest walls, right diaphragm, and left mediastinum. Asbestos mine workers have a higher extent of plaques and pulmonary fibrosis versus environmentally exposed individuals.
authors.affiliation: Department of Radiology, School of Medicine, Ewha Womans University, Seoul 07985, Korea.
authors.forename: Yookyung
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Department of Occupational and Environmental Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Jun-Pyo
authors.initials: JP
authors.lastname: Myong
authors.affiliation: Department of Radiology, School of Medicine, Ewha Womans University, Seoul 07985, Korea.
authors.forename: Jeong Kyong
authors.initials: JK
authors.lastname: Lee
authors.affiliation: Department of Radiology, Dongguk University Ilsan Hospital, Goyang 10326, Korea.
authors.forename: Jeung Sook
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Radiology, Gachon University Gil Medical Center, Incheon 21565, Korea.
authors.forename: Yoon Kyung
authors.initials: YK
authors.lastname: Kim
authors.affiliation: Department of Pathology, Yonsei University Wonju College of Medicine, Wonju 26426, Korea.
authors.forename: Soon-Hee
authors.initials: SH
authors.lastname: Jung
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017632:Asbestos, Serpentine / Q000633:toxicity*; D001195:Asbestosis / Q000000981:diagnostic imaging / Q000209:etiology*; D044466:Asian People; D004785:Environmental Pollutants / Q000633:toxicity; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008906:Mining; D016273:Occupational Exposure; D010995:Pleural Diseases / Q000000981:diagnostic imaging / Q000209:etiology*; D056910:Republic of Korea; D014057:Tomography, X-Ray Computed
chemical_list: D017632:Asbestos, Serpentine; D004785:Environmental Pollutants
keywords: Asbestos; Computed tomography; Occupational diseases; Pleural plaques