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Fig. 9. —41-year-old man with nasopharyngeal carcinoma and metastatic
lymph nodes in posterior triangle. Spectral Doppler sonogram shows high
vascular resistance of lymph node with resistive index (RI) of 0.85 and
pulsatility index (PI) of 2.18, which are higher than cutoff values commonly
used to differentiate benign and malignant nodes (RI, 0.7; PI, 1.5).
