Limited unilateral approach for extramedullary spinal tumours.

Traditionally, spinal extramedullary tumours are approached by a wide multilevel laminectomy and a midline dural incision. This exposure may result in immediate or delayed instability of the spine, and exposes the spinal cord to the possibility of inadvertent injury during surgery. To avoid these complications the authors have, in 27 patients, used a limited unilateral approach to remove extramedullary tumours. The approach entails bone removal which is limited to the lateral half of the lamina on the side of the tumour and may or may not include the medial part of the facet joint. A lateral dural flap exposes the tumour without exposing the cord. Extraspinal extensions of the lesion may be approached by extending the laminectomy further laterally to the facet joint. This technique has been used in the cervical, thoracic and the lumbar spine to radically remove the lesion in all cases. There were no complications. The authors conclude that extramedullary lesions of the spine can be removed radically by this approach which allows direct access without cord or root retraction, and with little disturbance to the normal anatomy.