Multiple sclerosis (MS) is a disease with multicentric lesions of central nervous system. These numerous lesions can cause a lot of different symptoms. Sometimes these signs are atypical and make difficulties for MS diagnosing. Hyperkinesis is extremely rare manifestation of MS especially if it concerns spinal myoclonus. Spinal myoclonic jerks can be caused by various focal damages of neuraxis including demyelination lesions. This report describes the case of spinal segmental myoclonus as an unusual manifestation of MS. The patient was diagnosed definite MS according to the McDonald criteria (2010). The nature of movement disorders was defined by careful neurologic and neurophysiologic examination. These movement disorders were reliably caused by demyelinating type lesions in the cervical cord.