Diffuse intracranial oligodendroglioma in a cow.

This report describes the clinical, morphological and immunohistochemical findings in an adult cow with cerebral oligodendroglioma. The tumour extended from the metencephalon to the telencephalon, with infiltration of the meninges. Immunohistochemically, the tumour cells lacked expression of a specific tumour antigen, were partially positive for S-100 and tau protein, and were negative for a range of antigens including glial fibrillary acid protein, neuron-specific enolase, myelin basic protein and synaptophysin. This is the first report describing a diffuse, cerebral oligodendroglioma in a cow.