Hepatoblastoma with erythrocytosis in a young female horse

Hepatoblastoma is a rare hepatic tumor that develops most commonly in juven ile domestic animals and humans. Hepatoblastoma can be associated with paraneoplastic syndromes such as eryt hrocytosis. Histologic examination of affected hepatic tissue provides the only definit ive method for diagnosis of hepatoblastoma. Concentrations of alpha-fetoprotein in serum or affected hepatic tissue may serve as a tumor marker but cannot be used alone to confirm a diagnosis of hepatoblastoma.