CTICasesActinomyces graevenitzii Pneumonia
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Imaging findings
CT showed multiple areas of nodular consolidation, some with a reverse halo sign, predominantly in the lower lobes. The pattern resembled organizing pneumonia.
Key takeaways
Actinomyces graevenitzii is an extremely rare bacterial pathogen, with only a few case reports in literature. It is one of eight new Actinomyces species defined by the CDC in recent years and does not produce sulfur granules. Pulmonary infection with this organism can present radiographically with an organizing pneumonia pattern, including nodular consolidations and reverse halo signs. It typically affects immunocompromised patients.
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