CTICasesTuberculosis with Micro-Nodular Atoll Signs
Imaging findings
Chest radiograph and CT show upper-lobe predominant fine nodules, bronchiectasis, and volume loss. A key CT feature includes micro-nodular atoll (reversed halo) signs and fairy ring patterns, with associated cavitary lesions.
Key takeaways
Mycobacterium tuberculosis can present with a granulomatous organizing pneumonia pattern, showing micro-nodular reversed halo/atoll signs. It must be distinguished from sarcoidosis and non-infectious organizing pneumonia.
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