CTICasesPulmonary Sarcoidosis (Fairy Ring Sign)
Imaging findings
CT shows a ring-like consolidation composed of tiny nodules mimicking a reversed halo or atoll sign (the "fairy ring sign"), in a patient with a known history of sarcoidosis.
Key takeaways
Sarcoidosis is a systemic granulomatous disease that can present with a wide variety of atypical pulmonary manifestations. The "fairy ring sign" refers to a ring-like cluster of tiny granulomatous nodules that mimics the reversed halo sign of organizing pneumonia; recognizing that the ring is composed of individual tiny nodules rather than confluent ground-glass helps differentiate it.
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