Color/power Doppler sonographic differential diagnosis of superficial lymphadenopathy: metastasis, malignant lymphoma, and benign process

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
T ShirakawaS Tada

Abstract

Differentiation of lymph nodes as metastasis, malignant lymphoma, and benign lesions by gray scale and color/power Doppler ultrasonography has been reported. In this study we sought to determine patterns of abnormal vascularity, the relationship between diagnostic criteria and node size, and which vessel in the node was best suited for Doppler spectral analysis. Extrahilar vessels, defined as vessels entering through the lymphatic surface and not through the hilus, were also investigated. One hundred twenty-nine nodes were examined by color/power Doppler ultrasonography. Extrahilar vessels were seen in 85.4% of metastatic, 40.5% of lymphomatous, and 7.7% of benign nodes regardless of node size. The mean pulsatility index and resistive index values of metastatic nodes were higher than those of benign nodes regardless of their size. Those of lymphoma were intermediate compared with the others. A pulsatility index greater then 1.3 and a resistive index greater than 0.72 suggested malignancy as measured from any vessel.

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