[Postmyelographic headache]

Prolonged cerebrospinal fluid leakage from the dural puncture site is considered the most important factor in the development of post-myelography headache. Incidences of post-myelography headache and post dural puncture headache vary a lot--possible reasons are discussed. The statement that patients with a low substance P level in cerebrospinal fluid are prone to developing a post dural puncture headache seems especially interesting. Articles considering clinical as well as experimental studies are reviewed.