title: Primary lateral sclerosis.
mesh_terms: D001921:Brain / Q000503:physiopathology; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009128:Muscle Spasticity / Q000175:diagnosis*; D010264:Paraplegia / Q000175:diagnosis*