Subdural catheterization and the injection of local anesthetics are rare complications of epidural anesthesia. Those complications reported have similar characteristics of the late onset of analgesia, extensive sensory blockade, moderate hypotension and the rapid recovery from anesthesia. We encountered an unusual presentation of subdural catheterization with a subsequent injection of local anesthesia that was identified radiographically and manifested as a non-detectable neural blockade. We discus the possible mechanisms for this complication.