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Type A Ring - muscular ring several centimeters proximal to squamocolumnar junction.
Type B Ring - Schatzki ring, typically located at the squamocolumnar junction. proximal margin of a hiatal hernia, only composed of mucosa and submucosa.
Type C Ring - indentation caused by diaphragmatic crura, rarely symptomatic
Please consider an official gastroenterology consult and refer to the sources below.