Atypical presentation of progressive supranuclear palsy.

Four pathologically documented cases of progressive supranuclear palsy are reported. Two patients exhibited severe dementia and 2 parkinsonism; none had the classic ophthalmoplegia. On retrospective analysis, clues to the diagnosis included early prominent gait disturbance, apraxia of eyelid opening in 1 patient, lack of tremor, poor response to levodopa-carbidopa, and severe rigidity with a posture of neck extension terminally in 1 patient. The clinical presentation of progressive supranuclear palsy, therefore, is not as stereotyped as previously thought, and the diagnosis can be overlooked if one adheres rigidly to the classic diagnostic criteria.