The Inflammatory Process and the Medical Imaging in Patients With an Inflammatory Disease of the Central Nervous System.

"USPIO MRI scanning will be performed at :~* baseline, month 3, month 6, month 9 and month 12 for patients recruited prior to the 1st of May 2010.~* baseline, month3, month 6 and month 9 for patients recruited between the 1st of May 2010 and the 31st of July 2010,~* baseline, month 3 and month 6 for patients recruited between the 1st of August 2010 and the 31st of October 2010,~* baseline and month 3 for patients recruited between the 1st of November 2010 and the 31st of January 2011,~* baseline for patients recruited between the 1st of February 2011 and the 30rd of April 2011.~Gadolinium MRI scanning will be performed at baseline, month 3, month 6, month 9, month 12, month 18, month 24 and month 36."