Figure 8 - Barium swallow of a patient with A and B rings of the distal esophagus.
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
Large arrow points to the B ring, and the small arrow points to the A ring.
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