Fig. 8From: Clinical and imaging characteristics in patients undergoing surgery for lumbar epidural lipomatosisIntraoperative findings. a Arterial line catheter (arrow) is introduced into the epidural space above the dural sac at an L4–5 interlaminar window. b The epidural pressure shows the fluctuation depending on blood pressure, and it is measured with an average of 25 mm H2O (square)Back to article page