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[Fine needle aspiration cytology as diagnostic bed-side method for differential diagnostics of enlarged peripheral lymph nodes].

Enlarged lymph nodes are a common diagnosis in clinical practice. The causes are varied and both benign or malignant processes might be responsible. Clearly it is important to quickly discern whether the origin is malignant or benign. The aim of this study was to evaluate the reliability and efficacy of aspiration cytology of enlarged lymph nodes. 398 patients with peripheral enlarged lymph nodes, who, in the course of a five-year period, were subjected to at least one immediate cytologic analysis (bed-side-analysis), were included in the study. For comparison the gold standard was defined as either the histological result of a corresponding biopsy or the clinical outcome within an observation period of one year. Cytology analysis reached a sensitivity of 97.6% and a specificity of 96.0% of all lymph nodes analysed. For metastatic lymph nodes of solid neoplasmas (mainly bronchial carcinoma) sensitivity was even 98.7% (90.6% for malignant lymphomas). In conclusion, fine needle lymph node aspiration cytology is a quick, reliable, technically simple method for further assessment of enlarged lymph nodes in order to distinguish between benign and malignant causes. Further differentiation of the underlying type of malignant origin can be achieved with high efficacy. Thus, in the hands of a qualified investigator, fine needle lymph node aspiration cytology is a suitable method for use on a bed-side basis.