Figure 5 - Evidence for barium stasis in valleculae and pyriforms (yellow thin arrows).
From the following article
A patient with chronic severe oropharyngeal dysphagia
Gary D. Gramigna and Raj K. Goyal
GI Motility online (2006)
doi:10.1038/gimo82
Also evidence of the posterior surface of the cricoid cartilage opposed to the posterior pharyngeal wall that constitutes the upper sphincter (blue short arrow).
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