Mycobacterium abscessus subspecies massiliense infection with anti-interferon-gamma autoantibodies

•Reports of NTM infections in adults with anti-INF-γ autoantibodies are increasing.•An IFN-γ release assay is useful for diagnosing anti-IFN-γ autoantibodies.•Difficult to exclude bacterial infection when cultures are negative.•Potential absence of granuloma formation in immunodeficiency cases.•Differential diagnosis and evaluation are important for early diagnosis of NTM.