CTICasesCryptogenic Organizing Pneumonia
Imaging findings
Serial chest radiographs show a patch of consolidation in the right lower lobe that persists and becomes denser peripherally with a central clearing. High-resolution chest CT shows a classic reverse halo (atoll) sign, characterized by a central ground-glass opacity surrounded by a complete ring of denser consolidation.
Key takeaways
The reverse halo or atoll sign is highly suggestive of organizing pneumonia, representing a ring of organizing pneumonia surrounding central alveolar inflammation or clearing. Cryptogenic organizing pneumonia (COP) is often a diagnosis of exclusion that is clinically post-infectious and highly responsive to corticosteroid therapy.
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