subpleural line

Subpleural lines (also known as pleural lines) refers to thin curvilinear opacities, 1-3 mm in thickness, lying less than 1 cm from and parallel to the pleural surface.

Etiology

  • dependent atelectasis of normal lung if seen in the dependent posteroinferior portion of the 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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