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Real‐world experience with the Sydney System on 1458 cases of lymph node fine needle aspiration cytology

Lymph node (LN) fine needle aspiration cytology (FNAC) is a safe, quick, inexpensive, reliable, and minimally invasive technique for the diagnosis of lymphadenopathies. Recently, an international committee of experts proposed guidelines for the performance, classification, and reporting of LN‐FNAC: the Sydney System. We set out to analyse the diagnostic performance of the Sydney System in a retrospective study.