Left lower lobe consolidation

Left lower lobe consolidation refers to consolidation in part (incomplete) or all (complete) of the left lower lobe.

Consolidation refers to the alveolar airspaces being filled with fluid (exudate/transudate/blood), cells (inflammatory), tissue, or other material.

The list of causes of consolidation is broad and includes:

Consolidation is usually obvious on CT with the anatomical location easy to define through visualization of the pleural fissures, however features can be subtle on chest radiography. 

Features of left lower lobe consolidation on CXR include:

It must be remembered that the homogeneity of the consolidation will be influenced by any underlying lung disease.

Occasionally with complete lobar consolidation, there may be an increased volume of the affected lobe, rather than the more frequent collapse. When the fissures are outwardly convex, the appearance is referred to as the bulging fissure sign.

A mnemonic to remember the general features of consolidation is A2BC3.


Article information

rID: 66157
System: Chest
Synonyms or Alternate Spellings:
  • LLL consolidation
  • Left lower lobe (LLL) consolidation
  • Consolidation of the left lower lobe

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Cases and figures

  • Case 1: LLL consolidation
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  • Case 1: lateral CXR LLL consolidation
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  • Case 2: LLL consolidation
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  • Case 3: LLL retrocardiac consolidation
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  • Case 4: apical segment LLL consolidation
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  • Case 6: LLL consolidation abutting the descending aorta
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