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Mesenterial involvement of Mycobacterium genavense infection: hard to find, hard to treat. Mycobacterium genavense is a rare pathogen affecting severely immunosuppressed patients. We report the case of persistent relapsing M. genavense infection in a 48-year-old African man with a positive diagnosis of HIV infection. Despite being under effective antiretroviral therapy with partial immune reconstitution, he developed irreversible long-term abdominal complications, possibly due to persistent M. genavense infection and sustained inflammation. Case management consists of individual risk assessment, close follow-up and personalised treatment strategies concerning the duration of antimycobacterial therapy and early application of steroids. Patients with profound immunosuppression, a high viral load at HIV diagnosis and a high burden of M. genavense, appear to be at higher risk. The pathogenicity of this complication is not well known and its optimal management has still to be determined.