B ring

Last revised by Osamah A. A. Alwalid on 4 Dec 2021

The B ring is a mucosal ring that develops in the distal esophagus at the gastro-esophageal junction (Z line). 

If the ring becomes symptomatic, then it is usually termed a Schatzki ring, although some use the terms synonymously.

Its development is thought to be a reaction to chronic irritation of the esophageal mucosa from gastro-esophageal reflux and it has squamous epithelium on its upper surface and columnar epithelium on its lower surface.

They are often associated with a hiatal hernia.

  • short annular ("ringlike") peptic stricture: these tend to make a broader impression on the distal esophagus than a B ring, which is usually <3 mm in thickness

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