Merck Manual

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Esophageal Neoplasia in Large Animals

By

Jan F. Hawkins

, DVM, DACVS, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University

Last full review/revision Oct 2021 | Content last modified Oct 2021
Topic Resources

The most common esophageal neoplasia in horses is squamous cell carcinoma, which carries a guarded prognosis. Focal neoplastic masses can be managed with esophageal resection and anastomosis. Unfortunately, most cases of squamous cell carcinoma are not amenable to surgery, and euthanasia should be considered.

In ruminants, bovine viral papillomas (ie, warts) occasionally develop in the cranial esophagus and pharynx and, in the presence of other agents, may result in development of esophageal carcinoma. In some areas of the world (eg, Scotland and South America), such disease may follow ingestion of natural bracken fern toxins Bracken Fern Poisoning in Animals Bracken fern, growing from large, dense, woody rhizomes, forms deciduous, stipitate, erect to spreading fronds with nonanastomosing veins. The pinnae are stalked, opposite or subopposite (inset)... read more Bracken Fern Poisoning in Animals . There is also a causal relationship between such bracken fern tumors and bladder cancers in cattle.

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