An 18-gauge tuohy needle was advanced slowly at the same interspace using a midline approach until a loss of resistance was achieved.A 20-gauge catheter was advanced through the tuohy needle with some resistance and was therefore withdrawn to reposition the needle.When the catheter was pulled out the distal 7.5 cm was missing.The needle was reinserted until loss of resistance and the catheter was advanced without pain or parasthesias to a depth of four centimeters into the epidural space.Following delivery, the patient underwent ct of her spine which failed to locate the catheter segment.The 18 mm material, consistent with an epidural catheter, was found in the l3-4 left epidural space on several cuts.
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