CTICasesPulmonary Tuberculosis (Fairy Ring Sign)
Imaging findings
CT chest in a 26-year-old female shows upper-lobe predominant consolidative and tree-in-bud nodular opacities, a cavitary lesion, and a reverse halo sign with a ring of small nodules (fairy ring sign) along the bronchovascular bundles.
Key takeaways
Pulmonary tuberculosis can present with a 'fairy ring sign', which is a reverse halo sign characterized by a central ground-glass area surrounded by a ring of small, active granulomatous nodules. This sign is highly suggestive of granulomatous diseases like TB or sarcoidosis rather than simple organizing pneumonia.
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