Advances: ? Progress in Pituitary Adenoma Biology. Results of Research and Clinical Applications (A. M. Landolt) ? Chemotherapy of Brain Tumors (J. Hildebrand, J. Brihaye) ? Supratentorial Arteriovenous Malformations of the Brain (S. Mingrino) Technical Standards: ? The Surgical Treatment of Syringomyelia (J. Hankinson) ? Surgical Approach to Lumbar Disc Herniations (F. Loew, W. Caspar) ? Recurrent Instability of the Cervical Spine With Neurological Implications ? Treatment by Anterior Spinal Fusion (B. Pertuiset, D. Fohanno, O. Lyon-Caen)