[A clinical case of demyelinating disease with basilar impression].

The authors report a clinical case of a 48-year-old female patient admitted to the Neurological Division following acute symptoms characterised by generalised asthenia, motory disorders (incoordination, equilibrium or gait deficit) accompanied by diplopia. Instrumental (medullary and encephalic NMR) and laboratory tests revealed a malformation of the atlo-occpital hinge with basilar impression and areas of corticosubcortical demyelinisation signifying multiple sclerosis. The liquor test was also positive for the presence of oligoclonal bands of IgG with a Link index of 0.97 (lower v.n. at 0.7). The association between these two pathologies is rare, whereas the need for a differential diagnosis between them often arises. Therefore, two pathologies which are mutually exclusive in many cases were present in an associated form in this case.