Figure 1. Preoperative MRI and PET-CT Imaging. (A, B) Represent enhanced magnetic resonance imaging (MRI) of the liver. A low signal intensity nodule is observed in the left medial segment of the liver, adjacent to the first porta hepatis, on the T1-weighted image. Following contrast administration, this nodule demonstrates significant arterial phase enhancement, accompanied by sustained enhancement during the portal venous and delayed phases. Furthermore, intrahepatic bile duct dilation is visualized. (C, D) Depict 18F-FDG positron emission tomography-computed tomography (PET-CT) images. In the porta hepatis region, a nodular soft tissue lesion measuring approximately 2.2 cm in its longest dimension is evident. This lesion exhibits increased FDG metabolism, with a maximum standardized uptake value (SUVmax) of approximately 4.4.