Figure 15b.   AIDS cholangiopathy in a 32-year-old man with elevated alkaline phosphatase levels. (a) MR cholangiogram shows multiple ductal stenoses and irregularities of the right hepatic ducts (arrows) and beading of the left hepatic ducts (arrowheads). (b) Endoscopic retrograde cholangiogram performed with balloon occlusion (arrowhead) helps confirm the ductal stenoses (arrows) noted at MR cholangiography.