Lobar lung collapse

Lobar collapse refers to the collapse of an entire lobe of the lung. As such it is a subtype of atelectasis (although collapse is not entirely synonymous is atelectasis), which is a more generic term for 'incomplete expansion'. Individual lobes of the lung may collapse due to obstruction of the supplying bronchus. 

Causes include:

Radiographic features

Radiograph

The appearance on chest x-ray varies according to the lobe involved and are discussed separately: 

Some features, however, are generic markers of volume loss and are helpful in directing ones attention to the collapse, as well as enabling distinction from opacification of the lobe without collapse (e.g. lobar pneumonia). These features include 5:

  • elevation of the ipsilateral hemidiaphragm
  • crowding of the ipsilateral ribs
  • shift of the mediastinum towards the side of atelectasis
  • crowding of pulmonary vessels or air bronchograms
CT

Lobar collapse is usually trivially easy to identify on CT, but identification of the cause is not always easy, as the collapsed lung can make identification of an obstructing lesion difficult.  

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Article Information

rID: 8311
System: Chest
Synonyms or Alternate Spellings:
  • Lobar atelectasis
  • Lobar lung atelectasis
  • Lobar collapse
  • Lobal volume loss

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Cases and Figures

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    Cystic fibrosis a...
    Case 1: cystic fibrosis and LUL collapse
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    Case 2: left lower lobe collapse
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    Right lower lobe ...
    Case 4: right lower lobe collapse
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    Collapse of the r...
    Case 5: right lung collapse
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