PURPOSE: To describe a 55-year-old male with Erdheim-Chester disease with bilateral orbital infiltration and visual loss who was successfully treated with interferon-alpha. METHODS: Interventional case report. RESULTS: The patient was treated with interferon-alpha and had an improvement in his clinical signs, including his visual acuity, after 4 weeks of interferon therapy. CONCLUSION: Interferon-alpha can be effective in the treatment of orbital infiltration secondary to Erdheim-Chester disease.
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