title: Visualization of orbital involvement of Erdheim-Chester disease on PET/CT.
abstract: We report a 58-year-old man who presented with swelling and redness in his left eye, headache, and blurred vision. A contrast-enhanced CT of the orbits revealed bilateral orbital masses. Whole-body PET/CT showed bilateral retrobulbar hypermetabolic soft tissue lesions, multiple areas of soft tissue involvement, and osseous lesions in bilateral lower extremities. An open surgical biopsy of the left orbital mass revealed xanthomatous non-Langerhans histiocytic infiltrate with Touton giant cells, positive for CD68 but negative for CD1a, establishing a diagnosis of Erdheim-Chester disease.
authors.affiliation: From the *Molecular and Imaging Therapy Service, Department of Radiology, Memorial Sloan-Kettering Cancer Center; †Department of Radiology, Weill Cornell Medical Center; ‡Developmental Therapeutics Unit, and §Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, NY.
authors.forename: Volkan
authors.initials: V
authors.lastname: Beylergil
authors.forename: Jorge A
authors.initials: JA
authors.lastname: Carrasquillo
authors.forename: David M
authors.initials: DM
authors.lastname: Hyman
authors.forename: Eli L
authors.initials: EL
authors.lastname: Diamond
mesh_terms: D001706:Biopsy; D031249:Erdheim-Chester Disease / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D008297:Male; D064847:Multimodal Imaging; D009915:Orbit / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D049268:Positron-Emission Tomography; D014057:Tomography, X-Ray Computed