Figure 9 - Barium swallow appearance of esophageal web.
From the following article
Pharyngeal and esophageal diverticula, rings, and webs
Julia J. Liu and Peter J. Kahrilas
GI Motility online (2006)
doi:10.1038/gimo41
The arrows point to the web. (Source: Courtesy of John M. Braver, Brigham and Women's Hospital.)
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