Figure 2.

Cholangiocarcinoma. Due to neoangiogenesis in the periphery of the tumor, strong arterial enhancement (arrow) and ductal dilatation (open arrow) are observed (A). On the equilibrium phase, the center of the mass is gradually enhanced because of the desmoplastic fibrous components of the tumor (arrow) (B). The hepatobiliary phase image also shows the enhancement of fibrous component. However, because there is significant uptake of contrast into surrounding liver parenchyma, the mass is relatively hypointensity (arrow) (C).