Gaillard F, Ranchod A, Niknejad M, et al. Bulging fissure sign (lobar consolidation). Reference article, Radiopaedia.org (Accessed on 16 Oct 2024) https://doi.org/10.53347/rID-9228
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.
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