Nontuberculous mycobacteria (NTM) commonly manifest as cervical lymphadenitis in immunocompetent children. Only a few species, such as Mycobacterium avium complex (MAC), cause infection in children. With recent advances in gene sequencing, Mycobacterium interjectum has been identified as a rare cause of adenitis in children, with at least 10 cases reported since 1993. Curative treatment for NTM lymphadenitis, particularly when caused by MAC, usually involves complete surgical excision of the affected lymph nodes. This case report highlights successful treatment of submandibular lymphadenitis caused by M. interjectum in a pediatric patient, despite multi-drug resistance in vitro.

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