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Type
Cause
Breeds Most Often Affected
Congenital megaesophagus
Abnormal nerve development in esophagus; sometimes part of more widespread nerve problems
Siamese
Vascular ring entrapment
Physical constriction of the esophagus by blood vessels
No breed tendencies reported
Cricopharyngeal achalasia
Failure of the cricopharyngeal muscle (in the throat) to relax during swallowing
Rare; no breed tendencies reported
