Peripheral nerve sheath neoplasms in canadian slaughter cattle.

Two thousand four hundred and fifty-six bovine neoplasms were submitted during a ten year period of which 238 (9.7%) were neurofibromas. The neoplasms were mainly in the heart but also in the thorax, mediastinum and in some visceral organs. On gross examination 41 of the 99 cardiac neurofibromas were suspected to be Cysticercus bovis. Immunohistochemistry for S-100 protein and neuron specific enolase staining was used to confirm the diagnosis in several cases.