Bulging fissure sign (lobar consolidation)

The bulging fissure sign refers to lobar consolidation where the affected portion of the lung is expanded causing displacement of the adjacent fissure. Any type of pneumonia or space-occupying process can lead to bulging (sagging) fissure sign. Classically, it has been described in right upper lobe (RUL) consolidation secondary to Klebsiella pneumonia. It is now rarely seen due to prompt antibiotic therapy for suspected pneumonia.

The most common infective causative agents are 1:

Other uncommon agents are:

  • Legionella pneumophila 3
  • Mycobacterium tuberculosis 

It may also be seen with:

Article information

rID: 9228
System: Chest
Section: Signs
Synonyms or Alternate Spellings:

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Cases and figures

  • Case 1: bulging fissure sign
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  • Case 2: Klebsiella
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