“…3 Erdheim-Chester disease typically involves the posterior portion of the orbit and is associated with widespread systemic disease that results in death due to infiltration of vital organs. 5,6 This disorder, 7,8 like NXG 9 and AXG, 10 has been routinely treated with combinations of systemic corticosteroids, cytotoxic agents, and radiotherapy. However, NXG and AXG tend to affect the eyelids and anterior orbital tissue.…”