Clinical History:4-year-old Holstein cow with a history of unilateral (right side) facial paralysis, keratitis, drooping of the right ear, head tilt, circling, stiffness of the right limbs, tremors, and recumbency. Necropsy Findings:The left side of the brainstem was swollen, multiple coalescing areas of the neuroparenchyma in this region were soft, tan-brownish, and slightly depressed on cut section (malacia).