Coup de poignard of Michon

Last revised by Rohit Sharma on 23 May 2023

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

Clinical presentation

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

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Cases and figures

  • Case 1: arterial perforation
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