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Intrahepatic cholangiocarcinoma. A: Baseline ultrasound shows an isoechoic mass in segment 5 of the liver; B: The lesion shows peripheral rim-like hyper-enhancement 26 s after contrast agent injection on CEUS; C: The lesion becomes hypo-enhanced 52 s after contrast agent injection; D: The lesion continues to be hypo-enhanced 121 s after contrast agent injection.
