title: Anatomical causes of failed spinal anaesthesia may be commoner than thought.
authors.forename: P A
authors.initials: PA
authors.lastname: Popham
mesh_terms: D000775:Anesthesia, Spinal / Q000009:adverse effects*; D006801:Humans; D052958:Tarlov Cysts / Q000150:complications*; D017211:Treatment Failure