CTICasesBacillus cereus Pneumonia
Imaging findings
Chest radiograph and CT in a neutropenic myeloma patient show a compact, focal area of lung consolidation mimicking a fungal infection (like aspergillus or zygomycosis). Bronchoalveolar lavage grew Bacillus cereus, and the consolidation improved on vancomycin.
Key takeaways
Bacillus cereus is a spore-forming Gram-positive rod best known for causing food poisoning (e.g. from reheated fried rice). However, in immunocompromised or neutropenic patients, it can behave as an opportunistic pathogen causing severe, necrotizing pneumonia that radiographically mimics fungal infection.
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