[Actinomycosis Empyema:Report of a Case].

A 73-year-old man was referred to our hospital with a right pleural effusion. Chest computed tomography( CT) showed multifocal pleural effusion, and chest drainage was performed. Actinomyces meyeri was detected in the pleural fluid culture. Despite antibiotic treatment, the patient's condition did not improve, and a curettage was performed for empyema. The chest tube was removed on postoperative day 7 and the patient was discharged home uneventfully on day 21. Intravenous antibiotics were given for 16 days, followed by oral antibiotics for 6 months. Actinomycosis empyema is a rare disease with no established duration of treatment, but a total of 6 to 12 months of treatment is generally recommended.