[Regressive bilocular acute pseudotumoral demyelinization. Second lesion development after 10 years of remission]

The authors report what seems to be the 4th case of acute pseudotumoral demyelinating disease with regressive evolution. Onset was marked by hemiplegia with tumoral pattern on CAT-scan and pneumoencephalography and an important cystic cavity at surgery. Controlateral hemiplegia occurred 2 months later. After a period of partial recovery a long period of remission was observed, followed by a relapse 10 years after the first symptoms. This case suggests that remissions reaching 10 years are possible in such pseudotumoral demyelinating disease, but also shows that there are late secondary evolutions, as in multiple sclerosis.