Celine Dion 'set for stage comeback in France for first time since being diagnosed with Stiff Person Syndrome' As she continues to battle the debilitating illness, Celine Dion is reportedly preparing to return to the stage in France for the first time since being diagnosed with Stiff Person Syndrome. 31 March 2026 Celine Dion is reportedly preparing to return to the stage in France for the first time since being diagnosed with Stiff Person Syndrome.