The operation report included the following findings: Cholangiocarcinoma from extrahepatic bile duct adhered to right hepatic artery, portal vein and gallbladder. Metastatic disease on liver (one single 2 cm metastasis in segment III), lymphovascular invasion.

Pathology findings correlated with op report. 

This case highlighted the difficulty in characterizing liver lesions. This patient underwent a lengthy surgical procedure for what was determined to be metastatic disease. 

Hepatic metastases tend to show mild to moderate high intensity signal on T2W imagine & low signal on pre-contrast T1. Cystic & necrotic metastases show T2 increase signal (commonly in neuroendocrine tumors and sarcoma). Some liver metastases may demonstrate T1 hyperintensity particularly if fat-containing or melanin/methemoglobin/protein containing (such as melanoma).