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Fig. 4 61-year-old man with postbiopsy focal cholangitis and
sectorial transient hepatic intensity differences. Axial gradient-echo
T1-weighted gadolinium-enhanced arterial phase MR image (TR/TE, 146/2) shows
wedge-shaped arterial phenomenon (arrowhead) caused by peribiliary
plexus impairment secondary to dilation of inflamed subsegmental biliary
vessels (arrow).