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There is an esophageal outpouching just above the diaphragm, clearly separate from the gastric fundus - which is below the diaphragm. On the earlier images, it was seen to fill fairly gradually with contrast, indicating the presence of retained food contents.
This case demonstrates a typical epiphrenic diverticulum. It is a pulsion diverticulum - or rather pseudodiverticulum as it lacks a muscularis layer. Although there is no known or demonstrable motility disorder in this case, this is a frequent association of epiphrenic diverticula.