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CASE REPORTS
JOURNAL ARTICLE
Endoscopic microscopic transpedicular thoracic discectomy. Technical note.
Journal of Neurosurgery 1997 July
In an effort to make thoracic discectomy simple and less invasive while using direct visualization, a 70 degrees-angled lens endoscope has been adopted to visualize the ventral aspect of the spinal cord dura mater during microsurgical thoracic discectomy via a transpedicular approach. The patient is positioned in a 60 degrees forwardly inclined lateral position with the side of the lesion facing upward. After radiographic corroboration of the correct level, a transpedicular approach is made using a 1.5-cm-diameter tubular retractor through a 2-cm-long paramedian transverse skin incision. With the aid of an operating microscope, the ipsilateral facet joint, including the upper portion of the pedicle, is removed using a high-speed drill, thus exposing the neural foramen, intervertebral disc, and upper portion of the pedicle leading to the vertebral bodies. When the herniated disc and bone spur have been removed laterally in relation to the spinal cord, creating a cavity under the operating microscope, a 4-mm-diameter rigid endoscope with a 70 degrees-angled lens is mounted to an endoscope holder so that the ventral aspect of the spinal cord dura mater can be visualized directly. With the aid of direct endoscopic visualization, the disc and bone spur, which compress the spinal cord anteriorly, are pushed away toward a cavity created at the intervertebral space and are removed using a downward-biting long-armed curette. Patients with myelopathy are kept overnight in the hospital; however, those with radiculopathy are discharged home on the same day as their operation. The surgical technique and two illustrative cases are reported.
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