[Neurologic manifestations related to HTLV-1 viruses].
The human T-cell leukaemia virus type 1 was the first human retrovirus to be isolated in 1980 by R. Gallo and coworkers. As its name indicates, this virus is responsible for adult T-cell leukaemia. In 1985, the neurological manifestations associated with this disease were isolated from the tropical spastic paraplegia group in Martinique. Since that time, such manifestations have been reported in non-tropical countries in other foci of viral endemia and sporadically outside these regions. These neurological manifestations are totally independent of the haematological manifestations with which they are virtually never associated. Frequent in areas of viral endemia, they may be encountered in other countries open to human migrations, where they are too often overlooked.