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Fig. 4C —56-year-old man with marginal isoechoic response and 18
x 18 mm tumor of pancreatic head. Sonograms obtained before (A)
and 15 (B), 25 (C), and 45 (D) sec after injection of
contrast agent. Peripheral region of tumor shows mild heterogeneous
enhancement on contrast-enhanced sonography, and hypoechoic area is reduced
(arrowheads, A and D).
