CTICasesOrganizing Pneumonia (The "Consumed Grapefruit" Sign)
Imaging findings
Chest CT scans demonstrate highly symmetric, peripheral-predominant consolidations in both lower lobes. Over time, these consolidations thin out and evolve into characteristic hollow, ring-like subpleural consolidations (the "atoll" or "reverse halo" sign), representing resolving organizing pneumonia.
Key takeaways
Organizing pneumonia often presents with bilateral, symmetric, subpleural consolidations that can mimic infectious pneumonia or infarction. The development of "atoll" or ring-like configurations (the "reverse halo" sign) is highly suggestive of organizing pneumonia, which typically responds well to steroid therapy and lacks the centrilobular nodularity of aspiration or infectious bronchopneumonia.
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