Most reported subdural injections are not in the subdural space, they are intradural!
Collier
Clive
C
D015360:Analgesia, Epidural / Q000009:adverse effects*; D000779:Anesthetics, Local / Q000008:administration & dosage; D004388:Dura Mater / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007268:Injections, Epidural; D011247:Pregnancy; D011859:Radiography; D013355:Subdural Space / Q000000981:diagnostic imaging*
D000779:Anesthetics, Local