- The Parkinson-Syndrome which is characterised by the clinical triad akinesis, rigor and passive tremor, is caused by Parkinson’s disease (PD) in about 70 % of the cases (Oertel et al., 2003). However, beside the Parkinson’s disease there are several, to some extent rare, so-called atypical Parkinson’s syndromes. The two most frequent of these atypical Parkinson-Syndromes are the