A<unk>  or<unk> –Gary ring is a narrowing of the lower esophagus that can cause difficulty swallowing (dysphagia). The narrowing is caused by a ring of mucosal tissue (which lines the esophagus) or muscular tissue. A<unk>  is a specific type of "esophageal ring", and<unk> s are further subdivided into those above the esophagus/stomach junction (A rings), and those found at the squamocolumnar junction in the lower esophagus (B rings). Patients with<unk> s can develop intermittent difficulty swallowing or, more seriously, a completely blocked esophagus. The ring is named after the German-American physician Richard<unk> .
Schatzki ring
Brock string
Woronoff's ring
Soemmering ring
Dieulafoy's lesion
Surfer's knots
Vossius ring
Cortes Lacassie syndrome