Pulmonary nocardiosis caused by mimicking lung cancer.

Nocardiosis is an uncommon infection caused by species, but it can often occur in immunocompromised patients. As computed tomography (CT) findings of pulmonary nocardiosis, consolidation, masses, and nodules are often found, but lymph node enlargement is infrequent. was first isolated in 2006, and there are still few reports on this microorganism. We report a case of pulmonary nocardiosis caused by presenting as a mass and lymph node enlargement that mimicked lung cancer. A 76-year-old man was referred and admitted to our hospital because of persistent cough, sputum production, and chest discomfort. Chest CT showed a mass in the superior segment of the left upper lobe and mediastinal lymph node enlargement. After we performed bronchoscopies, species was isolated in a cultured specimen and identified as . This case required differentiation from lung cancer and was difficult to diagnose.