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Second-order neuron Horner syndrome

Second-order neuron Horner syndrome. (A) There is right-sided ptosis and miosis in bright light. (B) The anisocoria is greater in the dark. (C) Chest radiograph shows a right apical mass (arrow) that proved to be a schwannoma. (Contributed by Dr. Lanning Kline.)

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Associated Disorders

  • Anisocoria
  • Horner syndrome
  • Miosis
  • Mydriasis
  • Transient pupillary abnormalities (cyclic oculomotor palsy, ophthalmoplegic migraine, tadpole pupils, benign episodic unilateral mydriasis)