[Dissociated sensory loss syndrome in multiple sclerosis].

Spatial and temporal dissemination of demyelinating lesions continue to provide the basis for diagnosing multiple sclerosis (MS). We describe 20 patients (from a series of 234 with MS) who experienced flare-ups consistent with sensory suspension syndrome (SSS). The presence of syringomyelic cavities (non communicating syringomyelia) was ruled out by nuclear magnetic resonance imaging (NMR). We discuss the possible locations of lesions responsible for this syndrome: the trigeminus, dorsal root entry zones, anterior medullary white matter, and the mid-lateral portion of the spinothalamic tract. MS should be included as a differential diagnosis in young patients presenting with SSS.