Four bovine meningeal tumors.

Four bovine meningeal tumors from a total of 14 brain tumors were recorded in the files of the Ontario Veterinary College and the Ontario Veterinary Laboratory Services Branch from the years 1966 to 1984. The affected cattle ranged in age from 10 months to adult. They exhibited various nervous signs and, in each case, the animals became recumbent. Tumors were located in various areas of the central nervous system. Neoplastic cells had oval vesicular nuclei containing numerous cytoplasmic invaginations. Virus particles were not observed. A fibroblastic appearance, with the presence of loose whorls or bundles, was present in all. Three of the tumors were invasive and were classified as a fibroblastic meningioma.