Subdural catheterization--probably not.
D000767:Anesthesia, Epidural / Q000009:adverse effects / Q000379:methods; D000772:Anesthesia, Local / Q000379:methods; D002404:Catheterization / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008578:Meninges; D008751:Methylene Blue; D013355:Subdural Space
D008751:Methylene Blue