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Fig. 4B. —68-year-old man with common hepatic duct cancer (circular lesion on sonograms). Sonogram at center of tumor (T) shows tumor around probe in circular fashion (arrowheads). In this position, distinction between polypoid lesion (Fig. 3C) and circular lesion (Fig. 4B) is difficult. At center of tumor, width of tumor (distance between probe and outer margin of tumor, width of B) is thicker than width of bile duct wall (inner hypoechoic layer, width of A in Fig. 4A) of proximal side.

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