Doen？a de Erdheim-Chester: relato de dois casos

erdheim-chester disease is a rare non-langerhans cell histiocytosis of unknown etiology, affecting multiple organ system, involving bones, central nervous system, eyes, lungs, mediastinum, kidneys and retroperitoneum. the authors report two cases that progressed with the typical presentation of the disease. radiological findings were in agreement with literature and guided the diagnosis, confirmed by immunohistochemistry.