A Schatzki ring or Schatzki-Gary ring is a ring foun in the lower part of the esophagus that can cause difficulty swallowing. The ring is made up of mucosal tissue (which lines the esophagus) or muscular tissue. Patients with Schatzki rings can develop intermittent dysphagia (difficulty swallowing), or, more seriously, a completely blocked esophagus. The ring is named after the American physician Richard Schatzki.