Progress and Prospects in Parkinson's Research/Symptoms/Chorea

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Chorea
Involuntary, desultory flickering movement.

The following references are relevant:-

Barbeau et al (1965)   Fingerprint Patterns in Huntington's Chorea and Parkinson's Disease 

Reuter et al (2000)  Late onset levodopa responsive Huntington's disease with minimal chorea masquerading as Parkinson plus syndrome 

Ciammola et al (2011)  Atypical Parkinsonism Revealing a Late Onset, Rigid and Akinetic Form of Huntington's Disease