Fig. 2. A , Transesophageal echocardiogram illustration exhibiting white thoracic epidural catheter and expanded posterior epidural space due to localized saline spread. Also identifiable on the image is the spinal cord, dura mater, subarachnoid space, and CSF. B , Transesophageal echocardiogram image exhibiting white thoracic epidural catheter and expanded posterior epidural space due to localized saline spread. Also identifiable on the image is the spinal cord, dura mater, subarachnoid space, and CSF. CSF = cerebral spinal fluid. Used with permission of the University of Iowa Hospital and Clinics, Iowa City, Iowa.