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Schematic representation of inguinal lymphatic drainage after tracer application. Right groin: Complete blockage of tracer flow. Tumor cells (red) prevent drainage of the peritumorally applied tracer into the inguinal lymph nodes. Left groin: Rerouting of the tracer flow into the so-called neo SLN. Tumor cells in the true SLN cause rerouting of lymphatic drainage and lead to new lymphatic pathways being opened. The tracer thus accumulates in the histologically negative neo SLN
