Clinical features and outcomes of lymphadenopathy in a tertiary children's hospital.

Aim: The aim of the present study is to describe the clinical features and outcomes of childhood lymphadenopathy and to define factors able to predict neoplastic aetiology or may improve its prognosis.

Methods: All children evaluated for lymphadenopathy in our tertiary children's hospital and who underwent their first examination between 1 January, 2015 and 31 December, 2017 were enrolled in this retrospective observational study. Data were analysed using SPSS.Statistics, 24.0.

Results: A total of 322 children, aged between 0 and 18 years (median 4.5; interquartile range 2.5-9), were enrolled. A specific diagnosis was achieved in almost half of the cases (n = 159, 49.4%) by using one or more methods, including serological, microbiological, biomolecular or histological investigations on surgical samples. Epstein Barr virus and non-tuberculous mycobacteria were the most common etiological agents among acute/sub-acute and chronic lymphadenopathy, respectively. At the end of the study period, two-thirds (210, 65.2%) of enrolled patients were successfully treated. Malignancies and non-tuberculous mycobacteria infections had the longest time to resolution.

Conclusions: Our data suggest that lymphadenopathy is a benign condition in most cases. Of note in our study, 2.5% of lymphadenopathy cases were found to be due to oncologic conditions. The most frequent infective causes were Epstein Barr virus, bacteria and non-tuberculous mycobacteria infections. No haematic or ultrasonographic features were independently able to provide sufficient evidence for a conclusive diagnosis. However, utilising these findings alongside evaluation for clinical criteria can guide decision-making for physicians. Lymphadenectomy is the most appropriate process to follow in the event of chronic lymphadenopathy with undefined diagnosis.