The duodenum's relation to the liver is:

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The liver and duodenum sit in very close contact where the liver sits atop the upper abdomen. The duodenum runs just beneath the liver, and its superior portion lies against the liver’s undersurface. The right lobe of the liver covers the lateral side of this duodenal region, while the medial portion of the left lobe extends toward the midline and also lies against the duodenum. So the duodenum is adjacent to both the right lobe and the medial aspect of the left lobe. This proximity is why you often see the duodenum just inferior to the liver on ultrasound and in imaging studies.