[Chronic progressive spinobulbar spasticity (primary lateral sclerosis)].

This paper presents an account of chronic-progressive Spinobulbar Spasticity (SBS) or Primary Lateral Sclerosis (PLS), a rare syndrome involving degeneration of the upper motoneuron, on the basis of 6 clinically examined cases. Individuals of both sexes can be affected. Onset of the syndrome occurs around the age of 54, but may sometimes be before 50.