Card 9 / 34: 14 week old dog presents with vomiting where food "plops out" in solid form 2-15 min after eating . Dog is is not retching and is always hungry. There is no weight loss and the dog seems to be healthy in other aspects. This dog is also up to date on vaccines. PE is normal including a normal gag reflex . A barium study radiograph is performed revealing dilation of the cervical and proximal thoracic esophagus with a narrowing in mid thorax . There is a normal caudal esophagus diameter. What is the most likely differential for this dog?
A) Esophagitis (most likely caused by caustic substance)
B) Myasthenia gravis
C) Congenital vascular ring anomaly
D) Esophageal foreign body
E) Acquired megaesophagus

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