Figure 8 - Zenker's diverticulum.
From the following article
Endoscopic evaluation of esophageal motility disorders
Susan E. McCormick and Richard A. Kozarek
GI Motility online (2006)
doi:10.1038/gimo29
The diverticulum is on the right and the true esophageal lumen is on the left. They are separated by a "bridge" of tissue.
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