Portal phase axial images: a large infiltrative mass involving both hepatic lobes with capsular retraction suggestive of cholangiocarcinoma. The case is pathologically proven cholangiocarcinoma. The post-procedural CT is limited as compared to PET/CT in diagnosing tumor response to therapy. Here the portal venous phase shows larger tumor size which either tumor necrosis or viable tumor tissues (tumor tissue didn't respond to microspheres targeted therapy). All the filled in areas on delayed images represent viable tumor tissues.
Delayed phase axial images: the size of the tumor has decreased on the delayed images consistent with viable tumor tissue (the areas that filled with contrast on delayed images).