Figure 6 - Cricopharyngeal contraction in achalasia.
From the following article
W.G. Paterson, Raj K. Goyal and Fortunée Irene Habib
GI Motility online (2006)
doi:10.1038/gimo20
Laterolateral film of the cervical spine showing air-fluid-solid level in the esophagus pushing the closed cricopharyngeus upward. (Courtesy of Dr F.I. Habib)
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