title: Chronic cystic lung disease: diagnostic accuracy of high-resolution CT in 92 patients.
abstract: OBJECTIVE
  The objective of this study was to determine whether the various chronic cystic lung diseases can be differentiated on the basis of the pattern and distribution of abnormalities on high-resolution CT.
  
  
  METHODS
  High-resolution CT scans in 92 patients with chronic cystic lung diseases (18 with pulmonary Langerhans cell histiocytosis, 18 with pulmonary lymphangioleiomyomatosis, 17 with usual interstitial pneumonia, 16 with lymphocytic interstitial pneumonia, 15 with emphysema, and eight with desquamative interstitial pneumonia or respiratory bronchiolitis interstitial lung disease) were retrospectively assessed by two independent observers without knowledge of the clinical or pathologic data. The observers recorded the abnormalities, the most likely diagnosis, and the degree of confidence in that diagnosis.
  
  
  RESULTS
  The two observers made a correct first-choice diagnosis in 148 (80%) of 184 interpretations. The correct diagnosis was made in 100% of interpretations of usual interstitial pneumonia, 81% of desquamative interstitial pneumonia or respiratory bronchiolitis interstitial lung disease, 81% of lymphocytic interstitial pneumonia, 77% of emphysema, 72% of lymphangioleiomyomatosis, and 72% of Langerhans cell histiocytosis. The two observers made a diagnosis with a high degree of confidence in 105 (57%) of 184 interpretations. The confident diagnosis was correct in 98 (93%) of 105 interpretations.
  
  
  CONCLUSIONS
  Although various chronic cystic lung diseases often have a characteristic appearance that allows their distinction on high-resolution CT, considerable overlap exists among the CT findings. Therefore, lung biopsy is often required for a definitive diagnosis.
authors.affiliation: Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Koyama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Johkoh
authors.forename: Osamu
authors.initials: O
authors.lastname: Honda
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Tsubamoto
authors.forename: Takenori
authors.initials: T
authors.lastname: Kozuka
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Tomiyama
authors.forename: Seiki
authors.initials: S
authors.lastname: Hamada
authors.forename: Hironobu
authors.initials: H
authors.lastname: Nakamura
authors.forename: Masanori
authors.initials: M
authors.lastname: Akira
authors.forename: Kazuya
authors.initials: K
authors.lastname: Ichikado
authors.forename: Kiminori
authors.initials: K
authors.lastname: Fujimoto
authors.forename: Toru
authors.initials: T
authors.lastname: Rikimaru
authors.forename: Ukihide
authors.initials: U
authors.lastname: Tateishi
authors.forename: Nestor L
authors.initials: NL
authors.lastname: Müller
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002908:Chronic Disease; D003560:Cysts / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed