SNCA and Parkinson disease: This iron accumulation hence triggers the aggregation of α-synuclein (Lingor et al., 2017) and increases the oxidative stress with a destruction of neurons (Sian-Hülsmann et al., 2011); therefore QSM imaging, measuring the impaired iron distribution in the parkinsonian brain, might give the neuropathological answer to dysfunctional neuronal networks (measured by MEG and rs-fMRI) in PD.