Progressive supranuclear palsy: pneumoencephalography, electronystagmography and treatment with methysergide.

15 patients with progressive supranuclear palsy (PSP) are presented with discussion of the value of pneumoencephalography (PEG) and electronystagmography (ENG) in confirming the diagnosis. PEG was performed in 6 patients, and revealed atrophy in the area of the pons and colliculi. ENG, which also was performed in 6 patients, 4 of whom had PEG, confirmed the defects in extraocular movement. Methysergide, which has been suggested as therapy for PSP, was utilized in 6 patients with no evidence of significant improvement.