The Mycobacterium terrae complex, consisting of three saprophytic species, (M. terrae, M. nonchromogenicum, \r\nand M. triviale), they rarely cause diseases in immunocompetent people. There are few case reports of lung \r\ninvolvement by Mycobacterium terrae complex. We reported a 13 years old immunompetent girl with a cavitary opacity \r\nseen on chest imaging and bronchoscopy revealed an endobronchial lesion, sputum and tissue specimens revealed \r\ngrowth of Mycobacterium triviale. Our patient is unique as it is the frst case reported in Saudi Arabia with this type \r\nof Mycobacteria, in addition there is no case reported in the literature with Mycobacterium triviale with endobronchial \r\nlesion, the patient treated with a combination of rifampicin, ciprofoxacin and ethambutol for six months, she showed \r\ngood response with resolution of radiological abnormalities and she did not have relapse after one year of follow up.
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