CTICasesKlebsiella Septic Embolism with Bird's Nest Sign
Imaging findings
CT chest shows multifocal, bilateral consolidative and ground-glass opacities. A prominent lesion in the right lower lobe shows central necrosis and a 'bird's nest' (reverse halo) sign. Blood cultures grew Klebsiella pneumoniae, representing septic emboli.
Key takeaways
The 'bird's nest' or reverse halo sign consists of a central ground-glass area surrounded by a ring of consolidation. While highly associated with mucormycosis or organizing pneumonia, it can also be seen in severe, necrotizing bacterial infections (like Klebsiella) causing septic embolization.
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