title: Pulmonary involvement in mixed connective tissue disease: comparison with other collagen vascular diseases using high resolution CT.
abstract: OBJECTIVE
  The purpose of this work was to compare the CT findings of lung involvement in patients with mixed connective tissue disease (MCTD) with those in patients with other CTDs: systemic lupus erythematosus (SLE), systemic sclerosis (SSc), and polymyositis and dermatomyositis (PM-DM).
  
  
  METHODS
  CT scans of 35 patients with interstitial lung disease and associated MCTD were evaluated retrospectively. The CT assessment included determination of the findings and evaluation of whether the findings in MCTD were different from those in other CTDs.
  
  
  RESULTS
  The frequency of ground-glass opacity in MCTD was significantly lower than in CTDs (p < 0.05). The frequency of honeycombing in MCTD was lower than in SSc (p < 0.05) and higher than in PM-DM (p < 0.005). Regarding the predominant CT patterns, the frequency of septal thickening in MCTD was significantly higher than in CTDs (p < 0.05).
  
  
  CONCLUSIONS
  CT findings in MCTD were a combination of those in other CTDs.
authors.affiliation: Division of Respiratory Medicine, Graduate School of Medical and Dental Sciences, Niigata University, Japan.
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Saito
authors.forename: Masaki
authors.initials: M
authors.lastname: Terada
authors.forename: Toshinori
authors.initials: T
authors.lastname: Takada
authors.forename: Takashi
authors.initials: T
authors.lastname: Ishida
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Moriyama
authors.forename: Hidemi
authors.initials: H
authors.lastname: Ooi
authors.forename: Takashi
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Hiroki
authors.initials: H
authors.lastname: Tsukada
authors.forename: Eiichi
authors.initials: E
authors.lastname: Suzuki
authors.forename: Fumitake
authors.initials: F
authors.lastname: Gejyo
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kihara
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003095:Collagen Diseases / Q000000981:diagnostic imaging*; D003882:Dermatomyositis / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008180:Lupus Erythematosus, Systemic / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D008947:Mixed Connective Tissue Disease / Q000000981:diagnostic imaging*; D017285:Polymyositis / Q000000981:diagnostic imaging; D011658:Pulmonary Fibrosis / Q000000981:diagnostic imaging*; D012595:Scleroderma, Systemic / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed