Figure 5.

Parenchymal mass-forming cholangiocarcinoma in a 36-year-old man. The lobular slightly hyperintense lesion (arrow) is seen in the liver segment IVA in a T2-weighted image (A) with subtle capsular retraction (dashed arrow). On a plain T1-weighted image (B), the tumor (arrow) is hypointense with irregular discrete peripheral and central enhancements in the arterial phase (C), mild progressive enhancement in the portal venous phase (D), and high signal intensity in DWI (E). Hematoxylin and eosin (H&E) staining (F) showed cholangiocarcinoma (arrowhead) with poorly differentiated components (dashed arrow). Normal liver parenchyma is also shown (arrow); original magnification ×40.