CTICasesPulmonary Aspergilloma
Imaging findings
A rounded density within a cavitary lesion in a patient with fibrotic interstitial lung disease; shows a characteristic rim of air that follows gravity (Monod sign).
Key takeaways
The term "Monod sign" is preferred over "air crescent sign" for mycetomas to avoid confusion with the air crescent sign seen in invasive fungal disease.
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