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Klebsiella pneumoniae lobar pneumonia with “bulging” fissure.
Frontal chest radiograph shows dense right upper lobe air-space opacity, which bows the right minor fissure inferiorly (arrows). The bulging fissure sign at chest radiography is traditionally associated with Klebsiella pneumoniae infection, but is actually nonspecific, and can be seen with other pulmonary infectious and noninfectious pulmonary processes as well.
(Courtesy Michael Gotway, MD.)
