We present a case of renal and, probably, bone mycobacteriosis by M. szulgai in a patient infected by the human immunodeficiency virus (HIV). M. szulgai is an atypical skotochromogen mycobacterium rarely described in the literature. Clinically, it is characterized by the predominance of pulmonary manifestations undistinguishables from M. tuberculosis, and rarely affecting other organs. In our environment, such mycobacterium has never been isolated in the main series published in the literature. The evolution of the patient was good, disappearing the clinical signs after the tuberculostatic treatment. The antibiogram showed resistance to rifampicine, piracinamide and ethambutol.