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US-3 positive observation in a 55-year-old woman with cirrhosis. Transverse gray-scale (a) and color Doppler (b) US images of the left portal vein show mural echoes (arrows in a) owing to a thrombus that meets the criteria for US-3 positive. The color Doppler US image (b) shows flow in the vein, a finding consistent with nonocclusive thrombus. A diagnostic test was recommended, and follow-up multiphase contrast-enhanced CT images (not shown) showed bland thrombus.
