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Bulging fissure sign

Dr Andrew Dixon and Dr Frank Gaillard et al.

The bulging fissure sign refers to lobar consolidation where the affected portion of the lung is expanded. It is now rarely seen due to the widespread use of antibiotics.

The most common infective causative agents are 1 

  • Klebsiella pneumoniae
  • Streptococcus pneumoniae
  • Pseudomonas aeruginosa
  • Staphylococcus aureus

Other uncommon agents are 

  • Legionella pneumophila 3

It may also be seen with bronchoalveolar carcinoma 4

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