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Fig. 4A. —53-year-old man with confirmed reactive lymph nodes in neck. Spectral Doppler sonogram shows low vascular resistance of lymph node with resistive index (RI) of 0.59 and pulsatility index (PI) of 0.94, which are lower than cutoff values commonly used to differentiate benign and malignant nodes (RI, 0.7; PI, 1.5).