Ultimobranchial Tumor of the Thyroid and Pheochromocytoma in the bull

Abstract
An ultimobranchial tumor of the thyroid and a phcochromocytoma occurred in a bull. The thyroid tumor contained amyloid. The occurrence of ultimobranchial tumor of the thyroid and phcochromocytoma was established in a large series of bovine necropsies and the co-existance of these tumors in the bull was highly significant; neither occurred in the cow.