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Fig. 4C. —68-year-old man with numerous calculi in upper biliary tract, common bile duct, and gallbladder. Anterior MR cholangiograms with maximum-intensity-projection (A), volume-rendered, (B), and thick-section half-Fourier rapid acquisition with relaxation enhancement (C) sequences show that calculi in upper biliary tract (straight arrows, B and C) are better shown in B and C than in A. Note that image in B clearly shows calculus in upper biliary tract that is superimposed by signal intensity of gastric juice (curved arrow, B).