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Klatskin tumor. A: Baseline ultrasound shows a hyperechoic mass (arrow) in the hilar bile duct; B: The lesion (arrow) shows homogeneous hyper-enhancement 14 s after contrast agent injection on CEUS; C: The lesion (arrow) becomes hypo-enhanced 45 s after contrast agent injection; D: The lesion (arrow) continues to be hypo-enhanced 126 s after contrast agent injection.
