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Fig. 4 —57-year-old man with mild biliary dilatation. The axial fat-suppressed T1-weighted image with fast low-angle shot (FLASH) sequence (TR/TE, 159/2.6; flip angle, 70°) shows bright high signal intensity in distal common duct (wide arrow), which was misdiagnosed as bile duct stone by one reviewer. This high signal intensity in distal common duct was caused by reflux of orally administered superparamagnetic iron oxide agent that had high signal intensity on T1-weighted images and low signal intensity on T2-weighted images. High signal intensity (thin arrows) in gastric lumen is also noted.