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This 29-year-old woman was admitted to the hospital because of repeated tonic-clonic seizures. The patient was a tour guide leading groups of tourist to Tibet for two-month walking/camping tours in the Himalayas. Her seizures were easily controlled by intravenous administration of phenytoin. The WBC count was 13,000, with 5% eosinophils; and the erythrocyte sedimentation rate was 19slightly elevated. A cranial CT performed with and without contrast revealed two ring-enhancing lesions. The patient underwent a craniotomy and excisional biopsy.