Navigating the Diagnostic Challenges in Lymph Node Cytology: The Case of Reactive Hyperplasia

Fine needle cytology (FNC) is a pivotal diagnostic tool for distinguishing between benign and malignant lymphadenopathies mainly because of its minimal invasiveness, cost-effectiveness and accuracy. A major requirement for maximising diagnostic accuracy is proper sample management of aspirated cellular material. In this diagnostic process, the morphological evaluation of adequate smears is paramount, guiding cytopathologists in the selection of appropriate ancillary tests through the recognition of cell size and patterns of distribution. Here, we describe a peculiar 'concentric ovals distribution pattern', frequently observed in the FNC of benign reactive lymph nodes, which may represent an aid in the cytological diagnosis of reactive hyperplasia.