There is also Mixed Type! Plus, I think we may need to establish genomic types. The following study tests people with idiopathic PD with SPECT scans. Would those with known mutations like LRRK2 respond differently??

Striatal FP-CIT uptake differs in the subtypes of early Parkinson’s disease

In idiopathic Parkinson’s disease (PD), a tremor-dominant type (TDT), an akinetic-rigid type (ART), and a mixed type (MT) are distinguished.

http://www.springerlink.com/content/p401815x11517j79/