Horner syndrome signs (mnemonic)

Last revised by Rohit Sharma on 8 Aug 2021

A mnemonic to remember the commonest signs of Horner syndrome is:



  • P: ptosis
  • A: anhydrosis
  • M: miosis
  • E: enophthalmos
  • L: loss of ciliary-spinal reflex
  • A: anisocoria

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