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Fig. 3D —70-year-old man with complete hypoechoic response and 8
x 7 mm tumor of pancreatic head. Sonograms obtained before (A)
and 12 (B), 16 (C), and 30 (D) sec after injection of
contrast agent. Tumor is clearly depicted on contrast-enhanced sonography as
hypoechoic tumor with high contrast, but reduction of hypoechoic area is not
observed (arrowheads, A and D).
