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Back Surgery - Multilevel Thoracic Spinal Fusion Procedure. This custom medical exhibit revels a posterolateral thoracotomy incision to access the thoracic spinal vertebrae. Additional surgical steps show detailed views of the thoracic spine and ribs with the following: 1. Discectomy, 2. Drilling of the vertebrae, and 3. Placement of BAK bone cages for spinal fusion.