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Figure 2. Dynamic Imaging for Evaluation for Hepatocellular Carcinoma. Axial CT images demonstrating the pre-contrast (A), hepatic arterial (B), portal venous (C), and delayed (D) post-contrast imaging phases. Pre-contrast imaging (A) is not required for HCC evaluation unless the patient has undergone local ablation that results in high attenuation material in the liver that may obscure enhancing lesions. The hepatic artery (white arrow) and portal vein (black arrow) demonstrate enhancement during the hepatic arterial phase (B). During the portal venous phase (C), the hepatic veins begin to enhance (black arrowhead). The hepatic veins, portal veins, and hepatic arteries demonstrate progressively decreasing enhancement during the delayed phase (D). HCC: hepatocellular carcinoma; CT: computed tomography