CASE REPORTS
JOURNAL ARTICLE
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Nontuberculous mycobacterial infection with concurrent IgG4-related lymphadenopathy.

Disseminated nontuberculous mycobacteria (NTM) infection with concurrent IgG4-related lymphadenopathy has not been reported. We described a patient with neutralizing autoantibodies to interferon-gamma (IFN-γ) and elevated levels of serum IgG4 presenting with generalized lymphadenopathy and reactive dermatosis. Histologically, lymph nodes (LNs) showed effaced nodal architecture with polymorphic infiltrates, mimicking angioimmunoblastic T-cell lymphoma. Both the absolute number and the ratio of IgG4+ plasma cells to IgG+ plasma cells were increased. Mycobacterium abscessus was isolated from cultures of LNs, and demonstrated by polymerase chain reaction-restriction fragment length polymorphism. The skin biopsy showed neutrophilic dermatosis, consistent with Sweet syndrome. The patient met the criteria of both adult-onset immunodeficiency syndrome and IgG4-related lymphadenopathy. This case provides evidence of disseminated NTM infection with concurrent type III IgG4-related lymphadenopathy in the patient with anti-IFN-γ autoantibodies.

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