=====Coup de poignard of Michon=====

Coup de poignard of Michon refers to [[spinal subarachnoid hemorrhage]], usually as a result of a [[spinal arteriovenous malformation]].

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.