title: [Letter: Painless or nearly painless gaseous encephalography].
mesh_terms: D002555:Cerebrospinal Fluid; D006261:Headache; D006801:Humans; D011011:Pneumoencephalography / Q000379:methods*; D011677:Punctures / Q000379:methods
vernacular_title: L'encéphalographie gazeuse sans douleur ou presque