Distinct clinical parameters were associated with shorter spontaneous resolution in children with non-tuberculous mycobacterial lymphadenitis

AimNon-tuberculous mycobacteria (NTM) lymphadenitis typically resolves spontaneously, yet factors influencing the duration remain explored. We aimed to identify clinical parameters associated with shorter spontaneous resolution.MethodsThis cohort study included children with NTM lymphadenitis from 1 January 2015 to 1 March 2021 at Copenhagen University Hospital. Time-to-event analysis assessed clinical parameters associated with the duration of NTM lymphadenitis.ResultsSixty children (57% boys) with a median age of 24 months (range 11-84) were included; 13 (22%) received primary surgery, 13 (22%) underwent surgery after a wait-and-see period and 34 (57%) received no intervention. In children without intervention, the median duration was 10 months (range 2-25). Faster resolution was associated with parental-reported lymph node enlargement within 2 weeks (HR 2.3, 95% CI 1.0-5.0; p = 0.044), abscess on ultrasound examination (HR 3.3, 95% CI 1.5-7.3; p = 0.003) and skin discoloration and/or perforation within 3 months of onset (HR 4.3, 95% CI 1.3-14.4; p = 0.017 and HR 3.7, 95% CI 1.5-9.1; p = 0.005).ConclusionKnowledge of predictors for shorter spontaneous resolution of NTM lymphadenitis, such as rapid initial lymph node enlargement, abscess on ultrasound examination, and skin discoloration and/or perforation within 3 months of disease onset, may guide clinical management decisions concerning surgery versus a conservative approach.