“…Although Actinomyces reside in the oropharynx and gastrointestinal tract, and are normally avirulent in healthy individuals (5,6), Actinomyces -associated diseases can occur in individuals with particular host characteristics [e.g., aspiration, alcohol abuse, periodontal disease, chronic obstructive pulmonary disease (COPD), and diabetes mellitus] (7). Pulmonary actinomycosis is relatively rare (8), and is thought to result from the aspiration of Actinomyces into the lungs (9). Although chest imaging of pulmonary actinomycosis most commonly reveals fibrotic infiltrates that are confined to a single lobe with small cavitary lesions (10), non-specific findings are commonly observed in clinical practice (11-13).…”