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The ultrasound study shows a subtle 1.5 cm diameter area of mild hyperechogenicity in the right lobe of the liver. Blood flow is seen in this area on the color doppler image.
The three CT images were obtained pre-contrast, arterial phase and portal phase. The 1.5 cm lesion seen on ultrasound is of low density on the unenhanced CT image; shows nodular peripheral enhancement during the arterial phase; and fills in completely by the portal phase.