A very rare paroxysmal symptom in multiple sclerosis: convergence spasm.

Multiple sclerosis affects many regions of the central nervous system and leads to visual, oculomotor, motor, sensorial, cerebellar, and cognitive disorders. In addition to classic clinical findings, sudden paroxysmal symptoms triggered by motion, hyperventilation, or sensory stimulus may occur. In this article, we present a case of convergence spasm attended by paroxysmal symptoms, a rarely observed situation but one which can have complete recovery through administration of 5-day intravenous (i.v.) methylprednisolone therapy, together with its imaging findings and video records.