PURPOSE: To report Lyme disease as the cause of chiasmal optic neuritis in a 10-year-old girl. METHODS: The patient underwent ophthalmologic, laboratory, and imaging examinations. RESULTS: The patient's history and clinical course were consistent with Lyme disease. Laboratory studies disclosed increased serum Lyme immunoglobulin G titer, which improved after antibiotic treatment. CONCLUSION: Lyme disease should be considered in the differential diagnosis of chiasmal optic neuritis.
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