Definition of Lower esophageal ring (Schatzki):

A lower esophageal ring is an abnormal ring of tissue that forms where the esophagus (the tube from the mouth to the stomach) and stomach meet.

Causes, incidence, and risk factors:

A lower esophageal ring is a matter of debate can be caused from swallowing dangerous acids or other corrosive materials. In some cases, it is a birth defect. Sometimes, it is due to injury caused by gastroesophageal reflux disease (GERD).

The condition may produce swallowing difficulties.