 30 patients with PD and 30 patients with MSA will be examined in a 3Tesla MRI. The aim of our project is to demonstrate that our multimodal MRI method can discriminate both diseases with a similar clinical presentation and monitor the progress of the disease. CICs expertise in recruitment and assessment of patients, and the powers of the INSERM U825 in terms of development and processing in neuroimaging guarantee the feasibility of the project and its successful completion. 