CTICasesOrganizing pneumonia
Imaging findings
Chest CT shows multiple bilateral ring-like consolidations with central ground-glass opacity (reversed halo or atoll sign) in a 20-year-old female presenting with cough and dyspnea, which relapsed after a steroid taper.
Key takeaways
The atoll sign (reversed halo sign) consists of a central area of ground-glass opacity surrounded by a complete or crescentic ring of consolidation. While classic for cryptogenic organizing pneumonia, it is a non-specific sign of lung injury that can be seen in infectious or inflammatory conditions.
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