Case report. The physical examination and roentgenograms revealed pathology in the left lung extending outward from the hilum, practically to the periphery. In spite of KI and roentgen therapy to chest, progress was steadily downward, and the patient died on the 85th day of the disease. The organism recovered from bronchoscopic material, sputa, pleural fluid before death and pleural fluid and multiple abscesses of the lung at post- mortem was A. graminis. Necropsy revealed actinomycosis of the left upper lobe of the lung with direct extension into the pericardium, giving rise to a subacute adhesive pericarditis, chronic myocarditis, and empyema in the left thorax.