What are the clinical subtypes of progressive supranuclear palsy (PSP)?

Updated: Sep 24, 2018
  • Author: Stephen M Bloomfield, MD; Chief Editor: Selim R Benbadis, MD  more...
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A study of 103 consecutive cases of pathologically proved PSP revealed 2 clinical subtypes. [25] The first, called the Richardson syndrome, occurred in 54% of the cases and was associated with an early onset of postural instability, supranuclear gaze palsy, and cognitive dysfunction. The second, called PSP-Parkinsonism, occurred in 32% of cases and had features more typical of idiopathic PD, including a moderate response to levodopa. Fourteen cases (14%) could not be classified according to these criteria. At the molecular level, the 2 subtypes were characterized by distinct tau isoforms, suggesting that they are discrete nosologic entities.

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