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The fluoroscopic images show the air and CO2 cholangiograms performed during the ERCP. The MRCP image of a patient shows the type IV hilar obstruction (a). The air cholangiogram of the same patient (b), followed by bilateral stenting (c). The MRCP image of another patient with type IV hilar obstruction (d). The CO2 cholangiogram of the same patient shows the selective wire cannulation of the right (e) and left (f) intrahepatic biliary system
