An Anterior Cervical Corpectomy [1] is a procedure performed when cervical disease encompasses more than just the disc space, such as multi-level cervical stenosis [2] or spinal cord compression caused by bone spur [3] growth. It involves the removal of the vertebral body as well as the disc spaces at either end, to completely decompress the cervical canal. This video gives a clear picture of anterior cervical corpectomy neck surgery.
Links:
[1] http://www.spine-health.com/treatment/back-surgery/anterior-cervical-corpectomy-spine-surgery
[2] http://www.spine-health.com/conditions/spinal-stenosis/cervical-stenosis-myelopathy
[3] http://www.spine-health.com/conditions/back-pain/bone-spurs-osteophytes-and-back-pain