Where is the duodenum relative to the liver?

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The duodenum sits just beneath the liver, in the upper abdomen, and runs under the liver’s inferior surface. Because the liver spans the right lobe and extends over the medial aspect of the left lobe, the duodenum lies in contact with both areas. So it is best described as adjacent to the right lobe and the medial part of the left lobe. The other descriptions don’t reflect this close contact under the liver: it isn’t primarily positioned posterior to the left lobe or superior to the right lobe.