Neoplasia of the equine gastointestinal tract and abdominal organs occurs p
redominantly in geriatric horses, although lymphoma and hepatocellular carc
inoma and a few other neoplasms can be found in young horses. This article
discusses diagnostics that can be used in weight-loss situations, suspiciou
s of neoplasia, as well as tumors themselves including clinical signs, diag
nostic tools, histopathologic appearance, and management.