Extraocular muscle involvement in thyroid associated orbitopathy (mnemonic)

Last revised by Mostafa El-Feky on 18 Oct 2019

A mnemonic to remember the order in which extraocular muscles are involved in thyroid-associated orbitopathy (TAO) is:

  • I'M SLOw


There is some debate about this however. Some claim superior rectus is most frequent 2, but the mnemonic "SIMLOW" is not as memorable.

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Cases and figures

  • Case 1: thyroid associated orbitopathy
    Drag here to reorder.
  • Case 2
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