Coup de poignard of Michon

Last revised by Jeremy Jones on 11 Oct 2013

Coup de poignard of Michon refers to spinal subarachnoid hemorrhage, usually as a result of a spinal AVM.

Presentation is with sudden excruciating back pain, akin to being stabbed with a dagger (poignard = french for dagger). It is the corollary of the thunderclap headache.

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Cases and figures

  • Dagger (photo)
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  • Case 1 : Arterial perforation
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