CTICasesPulmonary Rhizopus Mucormycosis with Bird's Nest Sign
Imaging findings
CT in a diabetic patient shows extensive sinus disease (rhinocerebral mucormycosis) and a small cavitating pulmonary nodule in the left upper lobe containing internal thread-like/mesh lines (bird's nest sign), confirmed as Rhizopus mucormycosis.
Key takeaways
Rhizopus is a member of the Mucorales order. Rhinocerebral and pulmonary mucormycosis occur in immunocompromised or diabetic patients. The 'bird's nest' sign of cavitating pulmonary consolidation with internal mesh-like lines is a highly suggestive radiographic feature.
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