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Fig. 4B —Dynamic contrast-enhanced sonographic images of liver of 58-year-old man with well-differentiated hepatocellular carcinoma (diameter, 2.2 cm) in lateral segment of left lobe. Tumor was misdiagnosed as benign when we evaluated only late phase. Arrows point to margins of tumor (suspected margins in late phase). Arterial phase image obtained at 25 sec shows marked intratumoral enhancement of lesion.