<unk>  B<unk>  at barium swallow. A<unk>  is usually diagnosed by esophagogastroduodenoscopy or barium swallow. Endoscopy usually shows a<unk>  within the lumen of the esophagus which can be of variable size (see picture). The<unk>  is usually located a few centimetres above the gastro-esophageal junction, where the esophagus joins the stomach.<unk> s can often resemble a related entity called an esophageal web. Esophageal webs also contain extra mucosal tissue, but do not completely encircle the esophagus. Endoscopies and barium swallows done for other reasons often reveal unsuspected<unk> s, meaning that many<unk> s are asymptomatic. Two varieties of<unk> s have been described. The original description by<unk>  and Gary was of a<unk>  of fibrous tissue seen on autopsy; this is the less common type of<unk> . More commonly, the<unk>  consists of the same mucosal tissue that lines the entire esophagus.
Schatzki ring
Brock string
Woronoff's ring
Soemmering ring
Dieulafoy's lesion
Surfer's knots
Vossius ring
Cortes Lacassie syndrome