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© 2004 BMJ Publishing Group Ltd
Treatment of Erdheim-Chester disease with cladribine: a rational approachC Myra1, L Sloper1, P J Tighe1,2, R S McIntosh2,3, S E Stevens2, R H S Gregson4, M Sokal5, A P Haynes6, R J Powell7
1 Division of Ophthalmology, University of Nottingham School of Clinical Laboratory Sciences, Queens Medical Centre, Nottingham NG7 2UH, UK
Correspondence to:
Accepted 5 November 2003
Keywords: Erdheim-Chester disease; cladribine; orbital pseudotumour; histiocytosis
Erdheim-Chester disease is a rare, life threatening lipoid granulomatosis1 with fewer than 100 cases described in the world literature. The disease typically affects the long bones and symmetrical sclerosis of the diaphyseal and metaphyseal regions is pathognomonic. Extraskeletal manifestations may affect the lungs, pericardium, aorta, retroperitoneum, skin, and orbits and diabetes insipidus occurs in approximately 30% of cases. Erdheim-Chester disease is characterised microscopically by an infiltrate of lipid laden foamy macrophages (histiocytes), scattered Touton giant cells, chronic inflammatory cells, and fibrosis. The foamy macrophages can be distinguished from Langerhans cells on the basis of negative results on staining for S-100 protein and CD1a. Treatment of the disease has been on an ad hoc basis and no treatment regimen has been shown to be clearly superior. This study documents the clinical findings in a patient with ErdheimChester disease, investigates the pathogenesis, and provides a rational basis for effective treatment.
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