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Fig. 4A. —76-year-old man with known cholangiocarcinoma (Klatskin's tumor). MR images were obtained to evaluate extent of disease. Porta hepatis mass (not shown) was causing biliary ductal obstruction. Mass measuring 3 cm located in medial aspect of right hepatic lobe was well visualized only on axial contrast-enhanced three-dimensional fast spoiled gradient-recalled echo image.