Dural puncture. Rotating needle increases risk.
Jordan
M J
MJ
D000767:Anesthesia, Epidural / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D004388:Dura Mater / Q000293:injuries; D006801:Humans; D009339:Needles; D012306:Risk; D013129:Spinal Puncture / Q000009:adverse effects