Lacks muscle layer (unlike distal esophageal A and B rings)
IMAGING
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Full column barium esophagram with rapid-sequence filming or have patient swallow small marshmallow followed by barium
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Appearance: 1-2 mm wide, shelf-like filling defect
Usually along anterior wall of cervical esophagus
Circumferential, radiolucent ring in some cases
May occur at other sites in esophagus
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Mild, moderate, or severe luminal narrowing
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Partial obstruction suggested by
Jet phenomenon: Barium spurting through ring
Dilatation of esophagus or pharynx proximal to web
TOP DIFFERENTIAL DIAGNOSES
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Esophageal strictures
Longer length of luminal narrowing of esophagus
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Schatzki ring
Lower (GE junction) esophageal or Β ring