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Breast cancer-related lymphedema (BCRL) is a common complication of breast cancer. 1 Indocyanine green (ICG) lymphography2 can assess lymphatic functionality. However, some patients undergoing taxane-based chemotherapy experience a period of interstitial edema during which no flow is observed on ICG lymphography, because when the dye is injected near the first web space over the dorsum of the hand, it does not flow beyond the wrist. 3 Over time, this resolves and either returns to normal or results in dermal backflow (DBF). The present study aimed to investigate the association between lymphatic functionality and the risk factors for BCRL using ICG lymphography, while particularly focusing on the no-flow pattern. This study retrospectively reviewed 422 breast cancer cases involving axillary lymph node dissection (ALND). BCRL was diagnosed based on ICG lymphography patterns or, for patients …