Subpleural line

Subpleural line refers to a thin curvilinear opacity, 1-3 mm in thickness, lying less than 1 cm from and parallel to the pleural surface.


  • dependent atelectasis of normal lung if seen in the dependent posteroinferior portion of lung of a patient in the supine position (disappears if prone slices are obtained)
  • pulmonary edema
  • fibrosis (other signs are usually present)
    • though described in the context of asbestosis, this sign is not specific for asbestosis.
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Article information

rID: 19146
System: Chest
Section: Signs
Synonyms or Alternate Spellings:
  • Subpleural lines
  • Subpleural line (HRCT)

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