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Pulmonary fungal balls are caused by long-term fungal infection of the lung. They are sometimes a complication of previous cavitary pulmonary tuberculosis. Pulmonary fungal balls caused by Trichophyton are extremely rare. A 65-year-old man who worked in a leather recycling factory was admitted because of a productive cough and shortness of breath. He had a history of tuberculosis with lung destruction. A chest radiograph showed an opacity surrounding an air lucency over the left lung field, and chest computed tomography showed a mass within a cavity, producing a ball-in-hole appearance, over the left upper lung lobe. Bronchoalveolar lavage was performed, and fungal culture of the lavage fluid yielded Trichophyton . After 6 months of treatment with oral itraconazole, the patient’s general condition improved. This case emphasizes the importance of awareness of fungal infection within cavitary lesions of the lung and shows that Trichophyton may be the etiologic organism in such cases. Itraconazole is a recommended treatment of pulmonary fungal balls.