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Images from a double contrast duodenal enteroclysis (note the post pyloric enteric tube on the first two images).
On the first six images -- the double contrast portion of the exam -- the polyp is partly lying in a small barium pool with the stalk partially visible. The margins of the polyp are etched with the barium.
The last image is essentially a single contrast image and the polyp presents as filling defect in the barium pool.