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Bronchial-associated lymphoid tissue (BALT) lymphoma is a rare condition that accounts for only 0.5-1% of all malignant lung tumours. We present the case of a 66-year-old man admitted with pneumonia for further study and therapy. Initially the sputum was positive for Mycobacterium tuberculosis complex using polymerase chain reaction technology and antituberculous therapy was initiated. Due to the lack of imagiological improvement, the patient underwent a pulmonary transthoracic biopsy that revealed BALT lymphoma. Months later, Mycobacterium chelonae was identified and specific therapy was started with clarithromycin and tobramycin, before initiating BALT treatment with cyclophosphamide. There are only a few documented cases of BALT lymphoma associated with Mycobacterium . In this case M. chelonae might have been present before BALT lymphoma, contributing as an immunologic stimulus, or appeared afterwards, in the neoplastic context. BALT has an indolent evolution with a good prognosis and that is the reason why some experts favour a “watchful waiting” option.

Case Report: Bronchial associated lymphoid tissue lymphoma and Mycobacterium chelonae