RT Journal Article SR Electronic T1 Erdheim-Chester Disease: MR Imaging, Anatomic, and Histopathologic Correlation of Orbital Involvement JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 627 OP 630 VO 25 IS 4 A1 de Abreu, Marcelo R. A1 Chung, Christine B. A1 Biswal, Sandip A1 Haghighi, Parvis A1 Hesselink, John A1 Resnick, Donald YR 2004 UL http://www.ajnr.org/content/25/4/627.abstract AB Summary: Erdheim-Chester disease (ECD) is a rare form of histiocytosis of unknown origin characterized by tissue infiltration by lipid-laden histiocytes. Typically, the diaphyseal and metaphyseal portions of the tubular bones are affected, leading to a characteristic radiographic pattern of bone sclerosis. Orbital involvement is not infrequent and is manifested by exophthalmos and periorbital xanthomatous lesions, with associated visual problems. This case report documents imaging and pathologic findings in a patient with ECD with extensive orbital involvement.