The Schatzki Ring or Lower oesophageal ring was first described by Schatzki and Gary in 1953. The classical symptom is episodic dysphagia especially concerning solid foods. Sometimes, a Schatzki ring can cause total obstruction resembling a foreign body in the oesophagus. Diagnosis is easily done by an endoscopic examination, and the disease can be successfully treated by endoscopic dilatation in the same session.
There has not been any publications about Schatzki Ring in the recent years. Here are some older references:
Desai DC, Rider JA, Pulletti EJ. Lower esophageal ring. Gastrointest Endosc 1968;25:100-105
Goyal RK, Bauer JL, Spiro HM. The nature and location of the lower oesophageal ring. N Engl J Med 1971;284:1175-1180
Johnson JH, Griffin JC. Anatomic location of the lower esophageal ring. Surgery 1967;61:528-554.
ShammaŽa MH, Benedict EB. Esophageal webs. A report of 58 cases an attempt at classification. N Engl J Med 1958;259:378-384.
Schatzki R, Gary JE. Dysphagia due to a diaphragm-like localized narrowing in the lower oesophagus, "lower oesophageal ring." Am J Roentgenol 1953;70:911-922.
Schatzki R, Gary RE. The lower esophageal ring. Am J Roentgenol 1956;75:246-261.
Tedesco FJ, Morton WJ. Loser esophageal webs. Dig Dis Sci 1975;20:381-383