title: Headache from intracranial air after a lumbar epidural injection: subarachnoid or subdural?
abstract: METHODS
  There is a growing awareness of the possibility of headache resulting from intracranial air secondary to identification of the epidural space by loss of resistance using air (LOR-A). Most reported cases have been attributed to subarachnoid air passage. A case is described of sudden headache following LOR-A.
  
  
  RESULTS
  Various features of the case suggest that the passage of air to the head was subdural rather than subarachnoid.
  
  
  CONCLUSIONS
  Recovery was uneventful.
authors.affiliation: Department of Anesthesiology, Medical College of Wisconsin, Milwaukee 53226.
authors.forename: Q H
authors.initials: QH
authors.lastname: Hogan
authors.forename: J D
authors.initials: JD
authors.lastname: Haddox
mesh_terms: D000328:Adult; D000388:Air; D005260:Female; D006261:Headache / Q000209:etiology*; D006801:Humans; D011007:Pneumocephalus / Q000150:complications*; D013346:Subarachnoid Space; D013355:Subdural Space