Purpose: We report a patient with severe multi-organ dysfunction of unknown origin who presented with bilateral orbital and chorioretinal manifestations that led to the diagnosis of Erdheim-Chester Disease (ECD). Observations: ECD is a rare. histiocytic. proliferative disorder characterized by multi-systemic organ involvement that has historically lacked effective therapy. https://www.roneverhart.com/Tasoliesi-Hackman-RTL-6-levyinen-15kW/