Unilateral Vertical Pendular Nystagmus in Multiple Sclerosis: A Distinctive Neuro-Ophthalmological Sign.

Lesions in multiple sclerosis can involve brain, optic nerve and spinal cord. We here report a patient of multiple sclerosis, who had unilateral vertical pendular nystagmus, because of simultaneous involvement of optic nerve and asymmetric brain stem lesions. This specific combination is rarely seen in other disorders, therefore can be considered as a distinctive neuro-opthalmoloical sign of multiple sclerosis.