Canine granulomatous meningoencephalomyelitis.

In 27 adult dogs with a distinctive chronic granulomatous meningoencephalomyelitis there were locomotor problems, cervical meningitis and blindness. Lesions were widespread, but most severe in cerebral and cerebellar white substance and in the cervical spinal cord. Lesions were characterized by the development of epithelioid cell granulomas arising from mononuclear cuffs. There were secondary edema and necrosis in severe cases and eventual fibroplastic repair in chronic cases. The cause is unknown.