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A small cholangiocarcinoma resulted in blockage of the bile ducts draining a portion of the left lobe of the liver. (a) Axial FDG PET of the upper abdomen shows hypermetabolic bile ducts (black arrowhead); (b) The bile ducts are dilated on axial contrast-enhanced CT (white arrowhead). The findings are consistent with post-obstructive focal cholangitis. This can result in a false-positive FDG PET-CT scan performed for cancer assessment.
