A 13-year-old girl of idiopathic polyneuritis with ophthalmoplegia, ataxia, and areflexia (Fisher's syndrome) was reported. Nine days be fore admission, the patient had a two-day histor-y of mild fever, sore throat, and nasal discharge. Two days prior to admission, she noted double vision, dysarthria, unsteadiness on walking, and numbness of both hands and feet. On admission, she was husky and flushed, and showed, bilateral ptosis. Neurological examination revealed a symmetrical external ophthalmoplegia. The eyes were immobile, and only medial movement was preserved. There was impaired vibration sense of extremities, but little motor wakness. Ataxia seemes to be of a cerebellar type, because dys metry and adiadochokinesis were also noted.
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