Research in the morphology-angioarchitecture and ultrastructure-of cerebral veins has been widely neglected in past decades; investigation was mainly focussed on the arterial side of brain circulation. This circumstance has certainly had a negative impact on the development of knowledge in clinical medicine about cerebral venous disease. Cerebra} venous pathology and its consequence is, however, a frequent problern in clinical neurosur gery, both with regard to operative techniques and conservative manage ment. Therefore, it is not surprising that the initiative to collect, for the first time, data on our present knowledge in basic research of cerebral veins, their structure and function under normal and pathological circumstances, came from clinicians. Regarding the cerebral veins the clinician has primarily in view the dysfunctions originating from embryogenetic malformations, phlebitic obstruction, tumourous shunts, or traumatic lesions. But in addition to that, particular attention should be paid to the microstructure ofthe venous vessel walls, their barrier function, and the venous vasomotor system. Studying these interrelationships has for a long time been both fascinating and of immediate interest to me."

Advances: H. Duffau: Subpial dissection and subcortical mapping with vasculature and white matter pathways preservation in surgery for brain (low grade) gliomas. - F. Scholtes, G. Brook, D. Martin: Spinal cord injury and its treatment: current management and experimental perspectives. - M. Sindou, M. Messerer, J. Alvernia, G. Saint-Pierre: Percutaneous Biopsy through the Foramen Ovale for Parasellar lesions: Surgical anatomy, Method and Indications. - Technical Standards: C. Raftopoulos, F. Waterkeyn, E. Fomekong, T. Duprez: Percutaneous pedicle screw implantation with robotic intraoperative 2D/3D fluoroscopy for refractory low back pain. I. Zemmoura, S. Velut, P. Francois: The choroidal fissure: anatomy and surgical implications. I. Timofeev, T. Santarius, A.G. Kolias, P.J.A. Hutchinson: Decompressive craniectomy operative technique and perioperative care. - S Fauser, J Zentner: Management of complex cortical dysplasia in epilepsy

"

At the request of a Subcommittee of the United States Senate, in February, 1975, the National Institute of Neurological Disorders and Stroke (now the National Institute of Neurological and Communi cative Disorders and Stroke) conducted a Workshop on the Research Status of Spinal Manipulative Therapy. The Workshop was held in response to the Senate Subcommittee's request for an "independent unbiased study of the fundamentals of the chiropractic profession. " Since spinal manipulative therapy is a key tenet of chiropractic, the Institute felt a research workshop focused on that issue would provide a useful base upon which to examine the broad concept of the role of biomechanical alterations of the spine in health and disease. This would include the pathophysiologic and clinical hypotheses formulated by medical and osteopathic physicians as w~ll as chiropractors. Why the relatively sudden interest of the Senate Subcommittee in chiropractic? There were probably many reasons for that interest, but suffice to say anticipation of discussion on the role of chiro practic in any national system of health insurance could in itself have provided adequate stimulus for the request. In any case, the NINCDS was asked to review what was and what was not known about the fundamentals of chiropractic. I stress "fundamentals" since as a research organization, the NINCDS is not charged with review ing matters such as clinical education, licensure or clinical prac tice. A small expert committee of scientific consultants helped the Institute design the format and agenda for the Workshop.

This book was born out of thirty years of didactic and practical experience with the intention of giving the reader concise neurosurgical elements and an appropriate selected iconography. This text wants to represent a practi cal and essential guide for the medical student and a useful reference point for specialists interested in pursuing more detailed literature studies. General practitioners and specialists in related subjects can consult this text to formulate a diagnosis and elaborate a proper therapy. November, 2000 The Authors Contents 1. CRANIAL DYSRAPHIAS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Arnold-Chiari malformation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Dandy-Walker malformation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Encephalocele . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Cranial dermic sinus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Corpus callosum agenesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. BRAIN TUMORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Epidemiology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Symptoms and signs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Intracranial hypertension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Focal symptoms and signs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Epilepsy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Language disorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Optic pathways disorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Apraxias. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Psychic disorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Cerebellar syndrome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Frontal lobe tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Parietal lobe tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Temporal lobe tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Occipital lobe tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Posterior cranial fossa tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Cerebellar tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Fourth ventricle tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Ponto-cerebellar angle tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 VIII Contents Brainstem tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Clivus tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Tumors of the cerebral ventricles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Tumors of the lateral ventricles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Third ventricle tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Fourth ventricle tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Pineal region tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Sellar and parasellar region tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Anatomopathological classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Benign cerebral tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Leptomeningeal tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Nerve sheath tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Vascular tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Dysembryogenetic tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Mixed cerebral tumors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Malignant cerebral tumors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Therapy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Pseudo tumor cerebri . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Phacomatosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3. INTRACRANIAL ANEURySMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S9 Epidemiology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The management of vascular and tumorous lesions of the parasellar region still remains one of the most demanding tasks in neurosurgery. It is only a short time ago that the major concepts of the anatomy of the so-called cavernous sinus were described in detail. Surgical interventions in this region are very complex, they are time-consuming and require an extensive back ground of experience in surgery of the cranial base. Pioneer anatomical studies of the parasellar region done by Taptas, and the daring direct operative approach introduced by Parkinson pro moted the development of modern neuroradiological intervention proce dures, which were initiated by Serbinenko and further refined by Debrun, Vifiuela and others. The technique of the detachable balloon catheter stimulated surgeons to proceed with the direct operative approach to lesions of the parasellar region. Today, it is hard to imagine a successful man agement of vascular pathologies of this region without a complementary use of the two techniques."

During recent years, major advances in surgical techniques, diagnostic methods, anesthesia and adjunctive treatment in the care of patients with subarachnoid hemorrhage have been achieved. Nevertheless, the overall outcome of patients with SAH cannot be regarded as satisfactory. The first part of the book concentrates on the pathogenetic mechanisms underlying vasospasm and edema, the principal causes of poor outcome. Recent progress in the field of membrane lipid metabolism has allowed the problem to be approached from an entirely new perspective. The possible participation of free radicals, membrane lipids and eicosanoids is thoroughly discussed. The second part features the problems of practical management of SAH patients. Timing and indication of surgery of aneurysms and the surgical techniques are described in detail.

These proceedings from the Xth Congress of the European Society for Stereotactic and Functional Neurosurgery in Stockholm reflect the growing interest in these fields of neurosurgery. It is the most extensive volume in this series of publications and it contains a large number of original articles pertaining to the most recent advances in stereotactic and functional neurosurgery. Not long ago stereotactic neurosurgery was considered an esoteric sub speciality practised only by those involved in treating movement disorders and pain. In the last decade we have witnessed the incorporation of stereotactic methodology in the management of common neurosurgical diseases, and the stereotactic technique is now practised in all major neurosurgical centers. As with other surgical techniques and tools, however, the utilization of stereotactic methods requires special knowledge and training. This book comprises articles which give insight into new stereotactic applications and technology. For example, the usage of stereotaxis without a frame and the so-called navigator systems in open tumor surgery is dealt with in two papers. The introduction and development of radiosurgery is closely linked to the advancement of stereotactic technique. Radiosurgical treatment of tumors and cerebrovascular diseases has been one of major achievements in modern neurosurgery. This publication contains several original reports illustrating the efficacy of radiosurgery in problematic neurosurgical diseases.

Percutaneous nuclectomy according to the Onik method is an avantgarde method used to remove the intervertebral disc by percutaneous access and with closed surgery. The instrumentation and the procedure are simple. The main feature is the smaller diameter of the probe (2mm) which fragments and aspires the small chips of pulpy nucleus. It reduces the risk of discitic infections (occurring in various percentages with all methods of percutaneous discectomy) because the hole in the anulus, being small, closes spontaneously after the probe is removed. Moreover postoperative acute lumbar pain has been reported to occur less frequently. This method is carried out under local anesthesia, with radioscopic and intraoperative discographic monitoring. By consulting this atlas orthopaedists, neurosurgeons and neuroradiologists may learn this method easily, because every detail is clearly presented and illustrated with a great number of coloured pictures.

Neurological applications of PET include using itto identify Alzheimer's Disease, including differentiating between other forms of Dementia, to show causes of seizures that were otherwise unclear, and to diagnose psychiatric disorders like Schizophrenia. Although other books on PET may have a chapter or section on neurological applications, this is the only comprehensive and up-to-date book on neurological PET. It reviews PET in neuroscience with particular emphasis on findings that indicate its potential for improving diagnosis and treatment in neurology and psychiatry. Improving the transfer of the huge scientific developments in brain PET into clinical carewill produce tangible human benefit. To this end, "NeuroPET" focuses on practical and potentially clinically relevant issues and identify solid ground as well as open questions. In addition, the book includes major chapters on the methodological background, including tracer physiology and kinetic modeling, and a comprehensive literature review."

This volume contains the papers presented at the International Symposium on Spine and Spinal Disorders in Growth and Aging held in Niigata on November 22-23, 1992. The symposium commemorates the 75th anniversary of the foundation of the Department of Orthopedic Surgery, Niigata University School of Medicine. . The purpose of the symposium was to investigate the field of spine and spinal disorders in growth and aging. Topics ranged from osteoporosis, other of the spinal column to degenerative metabolic bone diseases, and deformity spinal disorders and heterotopic ossification with resultant myelopathy. Spinal manifestations of systemic and local diseases were also included. Symptoms of spinal disorders in both the lower and upper extremity were presented and biomechanics and bone mineral measurement of the spine were also discussed. The organizing committee would like to thank the following for their sponsorship and support of this international symposium: Japan Osteoporosis Foundation, Japan-North America Medical Exchange Foundation, Japan Russia Medical Exchange Foundation, Niigata Prefectural Government, and Niigata City Government. We deeply appreciate their support and contributions to the success of the symposium. The chairman of the organizing committee is most grateful for the contributions and support of the International Advisory Committee, Dr. B.D. Burr (USA), Dr. H.M. Frost (USA), and Dr. R.R. Recker (USA); the Local Advisory Committee, Dr. S. Kono (Prof. Emeritus of Niigata University) and Dr. T. Tajima (Prof. Emeritus ofNiigata University); and the members of the organizing committee, Dr. Y. Watanabe (Yamagata University), Dr. K.

In this text atlas of neuroimaging the author provides a review of the pathologies and diseases that affect the head, brain, skull base, face, spine, and cord. The case presentation format of this handbook covers the important clinical and neuropathological aspects of the disease process. The book contains 350 selected pathologies, represented in 750 high resolution MR images. It also covers the aspects of neurological disorders and the fundamental aspects of the physics of magnetic resonance, spectroscopy, as well as a review of MR techniques. Given its scope, this book is of interest to radiologists involved in MR interpretation, neuroradiologists seeking an up-to-date review, and all workers in the field of diagnostic and therapeutic neurology.

Epilepsy surgery is defined as any neurosurgical intervention whose pri- mary objective is to relieve medically intractable epilepsy (European Fed- eration of Neurological Societies Task Force 2000). The aim of epilepsy surgery is to reduce the number and intensity of seizures, minimise neuro- logical morbidity and antiepileptic drug (AED) toxicity, and improve quality of life. By definition, epilepsy surgery does not include normal surgical treatment of intracranial lesions where the primary goal is to di- agnose and possibly remove the pathological target, often an advancing tumour. In these patients, epileptic seizures are only one symptom of the lesion and will be treated concomitantly as part of the procedure. Temporal lobe epilepsy (TLE) is recognised as the most common type of refractory, focal epilepsy. In one third of all cases the neuronal systems responsible for the seizures that characterise this form of epilepsy fail to respond to currently available AEDs (Andermann F 2002). New imaging methods, especially magnetic resonance imaging (MRI), identify localising abnormalities in an increasing proportion of patients with intractable focal epilepsy. Consequently, the accuracy of the preoperative diagnostic pro- cedures has been significantly improved during the last decade; and suit- able candidates for surgery can be selected more reliably. Currently the main resources in most epilepsy surgery centres have been used to evaluate candidates for TLE surgery.

This text examines the dominant ways of looking at patient/clinician relationships in healthcare. By challenging these dominant views the author can explore presuppositions that are defective. She further explains how they come to be so readily and uncritically held and reinforced; and, why their implications can have such a profound affect on how we think and act. Using the methodology of philosopher, John Dewey, the author proposes an alternative bio/psycho/social approach to understanding the patient/clinician relationship and for resolving increasingly common bioethical issues that arise in healthcare settings.

This volume contains 121 representative works on hydrocephalus which are collected from 24 listed journals and books in the field of neuroscience published in 1988. We express OUf sincere thanks to all authors, listed publishers and editorial boards for their cooperation and permission on this publication. It isour pleasure ifthis book willprovide you with an up-to-date review of the works on hydrocephalus. The editors ACKNOWLEDGMENT Greatful acknowledgments for permission to reproduce copyright material are made to the editors and the publishers listed below: Acta Neurochirurgica: Springer-Verlag, Wien American Journal of Neuroradiology (AJNR): American Roentgen Ray Society American Journal of Psychiatry: The American Psychiatrie Association Archives of Neurology: American Medical Association Brain and Development: (Official Journal) The Japanese Society of Child Neurology Brain Research: Elsevier Science Publishiers B. V. Child's Nervous System: Springer-Verlag, Berlin CT Kenkyu/Progress in Computerized Tomography: Neuron Publishing Co. Journal of Neurology, Neurosurgery and Psychiatry: British Medical Journal Journal of Neurosurgery: The American Association of Neurological Surgeons Journal of Pediatric Neurosciences: Springer-Verlag, Heidelberg Journal of Pediatric Surgery: Grune & Stratton, Inc. Nervenarzt: Springer-Verlag, Berlin Neurologia Medico Chirurgica (Tokyo): (OfficialJournal) The Japan Neurosurgical Society Neurology: Modern Medicine Publications, Inc.

It is estimated that the functionally significant body of knowledge for a given medical specialty changes radically every 8 years. New specialties and "sub-specialization" are occurring at approximately an equal rate. Historically, established journals have not been able either to absorb this increase in publishable material or to extend their readership to the new specialists. International and national meetings, symposia and seminars, workshops, and newsletters suc cessfully bring to the attention of physicians within developing spe cialties what is occurring, but generally only in demonstration form without providing historical perspective, pathoanatomical corre lates, or extensive discussion. Page and time limitations oblige the authors to present only the essence of their material. Pediatric neurosurgery is an example of a specialty that has de veloped during the past 15 years. Over this period neurosurgeons have obtained special training in pediatric neurosurgery and then dedicated themselves primarily to its practice. Centers, Chairs, and educational programs have been established as groups of neuro surgeons in different countries throughout the world organized themselves respectively into national and international societies for pediatric neurosurgery. These events were both preceded and fol lowed by specialized courses, national and international journals, and ever-increasing clinical and investigative studies into all aspects of surgically treatable diseases of the child's nervous system.

The scientific contribution of Mike Bradbury to the study of the blood-brain barrier is considerable and wide-ranging, starting with his M.D. thesis in 1962 and still continuing today. The varied spectrum of topics relating to the blood-brain barrier presented in this volume and the many geographical locations from which both speakers and participants gathered to attend the symposium are a fitting testament both to Mike's wide-spread influence in the field and to the esteem in which he is held. When we first had the idea of afestschrift to mark Mike's retirement as Professor of Physiology at King's College London and the beginning of a new vie libre as scientist and yachtsman the plan was initially for a gathering of all of the many colleagues, collaborators and students who had worked with him over the years. However what we had not taken into account was the closeness of the international community of workers in the field, the widespread influence that Mike had wielded and the speed with which word would spread. We should have anticipated all three. The final outcome was an excellent symposium with the majority of the world's key workers either contributing or attending. We hope that this volume presents an adequate record of the meeting.

How does the brain code and process incoming information, how does it recog nize a certain object, how does a certain Gestalt come into our awareness? One of the key issues to conscious realization of an object, of a Gestalt is the attention de voted to the corresponding sensory input which evokes the neural pattern underly ing the Gestalt. This requires that the attention be devoted to one set of objects at a time. However, the attention may be switched quickly between different objects or ongoing input processes. It is to be expected that such mechanisms are reflected in the neural dynamics: Neurons or neuronal assemblies which pertain to one object may fire, possibly in rapid bursts at a time. Such firing bursts may enhance the synaptic strength in the corresponding cell assembly and thereby form the substrate of short-term memory. However, we may well become aware of two different objects at a time. How can we avoid that the firing patterns which may relate to say a certain type of move ment (columns in V5) or to a color (V 4) of one object do not become mixed with those of another object? Such a blend may only happen if the presentation times be come very short (below 20-30 ms). One possibility is that neurons pertaining to one cell assembly fire syn chronously. Then different cell assemblies firing at different rates may code different information."

When I first proposed this book, one of the hopes was that it would be the stage upon which would be conducted a quiet, well reasoned discussion of the various techniques of stereotactic radio surgery. At that time, there was quite a bit of rancorous debate that tended to obscure the scientific and medical merits of each of the separate methods. At the present time, I am happy to report that the field of stereotactic radiosurgery is much less riven by such inappropriate posturing. The field has taken many steps towards maturity, both technically and medically. In the course of this mat uration process, there have been many grandiose plans and speeches made on behalf of stereotactic radiosurgery. Inevitably, the reality will not live up to the hype, but such is the natural course of devel opment in these sorts of matters. However, even though events may not match our hopes, we should keep in mind the words of Herbert Parker. Recognizing that new modalities for the treatment of cancer do not stand much chance of revolutionary success, nevertheless, he quite correctly pointed out that " . . . with any type of radiatiQn, the margin between success and failure is small. If the chance of success is a little greater . . . thi~ might well be classed as a great advance. " Mark H.

In August of 1991, a second Dartmouth International Workshop on the corpus callosum was convened to share and discuss the progress that had been made over the decade that had passed following the first workshop. A nucleus of basic and clinical scientists came together to discuss their work and the work of others in a field that has been broadened clinically by the addition of many new centers throughout the world that are now performing corpus callosotomy for intractable epilepsy. This text was stimulated by the participants' presentations and associated fertile discussions. It is compiled from the conference and subsequent studies. It reflects, both at the basic and clinical level, an important and expanding field of neural science endeavor. In keeping with the present and rapidly expanding field of outcomes assessment, callosotomy is again evaluated in light of a further decade of surgery and follow-up. Callosotomy continues to be a useful, palliative procedure and the indications for its use have been better established. The basic science section is a supplement to the first edition and elaborates progress in both new data and ideas. The section on experimental epilepsy models adds further support to the clinical rationale for callosotomy. Perhaps of greater importance is the contribution of experimental models to our understanding of the propagation of seizure activity. The section on the neuropsychology of the split brain patient demonstrates the continuing major contributions to the understanding of brain and behavior that pour forth from this cornucopia.

In this volume, world authorities on spinal surgery from the fields of Neurosurgery, Orthopaedic Surgery, and Neuroscience present current data on the basic science and clinical management of the unstable spine. Unique to this book: a frank presentation of controversies in the field.

Some 29 scientists from the fields of neuroanatomy, neurochemistry, neu rophysiology, neuropharmacology, and behavior have contributed their ef forts to this testimonial on behalf of the contributions made by Dr. F. W. L. Kerr to science and to those with whom he interacted. The intention of the contributors to this volume was to deal with the manifold advances that pertain to the substrates in spinal cord relating to the processing of sensory infor mation, a subject that in one form or another provoked time and again Kerr's native enthusiasm for research. The organization of the book follows a natural course from the peripheral innervation of the somatic and visceral organs (Winkelmann, Chapter 2) to the effective stimuli that activate these fibers and give rise to sensation under normal and pathological conditions (Campbell and Meyer, Chapter 3; Dubner and colleagues, Chapter 13; Dyck, Chapter 14) to the course these afferent systems take to enter the spinal cord (Coggeshall, Chapter 4) and to the organization of the systems through which this afferent information reaches the brain (Willis, Chapter 11; Vierck and colleagues, Chapter 12)."

Intraoperative imaging technologies have taken an ever-increasing role in the daily practice of neurosurgeons and the increasing attention and interest necessitated international interaction and collaboration. The Intraoperative Imaging Society was formed in 2007. This book brings together highlights from the second meeting of the Intraoperative Imaging Society, which took place in Istanbul-Turkey from June 14 to 17, 2009. Included within the contents of the book is an overview of the emergence and development of the intraoperative imaging technology as well as a glimpse on where the technology is heading. This is followed by in detail coverage of intraoperative MRI technology and sections on intraoperative CT and ultrasonography. There are also sections on multimodality integration, intraoperative robotics and other intraoperative technologies. We believe that this book will provide an up-to date and comprehensive general overview of the current intraoperative imaging technology as well as detailed discussions on individual techniques and clinical results.

* . . . . At last the doctor will be freed from the tedious interpretation of screens and photographs. Instead, he will examine and scan through his patient directly. Wearing optical-shutter spectacles and aiming a pulsed laser torch, he will be able to peer at the beating heart, study the movement of a joint or the flexing of a muscle, press on suspect areas to see how the organs beneath respond, check that pills have been correctly swallowed or that an implant is savely in place, and so on. A patient wearing white cotton or nylon clothes that scatter but hardly absorb light, may not even have to undress . . . . *. David Jones, Nature (1990) 348:290 Optical imaging of the brain is a rapidly growing field of heterogenous techniques that has attracted considerable interest recently due to a number of theoretical advantages in comparison with other brain imaging modalities: it uses non ionizing radiation, offers high spatial and temporal resolution, and supplies new types of metabolic and functional information. From a practical standpoint it is important that bedside examinations seem feasible and that the implementations will be considerably less expensive compared with competing techniques. In October 1991, a symposium was held at the Eibsee near Garmisch, Germany to bring together the leading scientists in this new field.

The intracarotid amobarbital (or Amytal) procedure is commonly referred to as the Wada test in tribute to Juhn Wada, the physician who devised the technique and performed the fIrst basic animal research and clinical studies with this method. Wada testing has become an integral part of the pre operative evaluation for epilepsy surgery. Interestingly, however, Wada initially developed this method as a technique to assess language dominance in psychiatric patients in order that electroconvulsant therapy could be applied unilaterally to the non-dominant hemisphere. Epilepsy surgery has matured as a viable treatment for intractable seizures and is no longer confmed to a few major universities and medical institutes. Yet, as is increasingly clear by examining the surveys of approaches used by epilepsy surgery centers (e.g., Rausch, 1987; Snyder, Novelly, & Harris, 1990), there is not only great heterogeneity in the methods used during Wada testing to assess language and memory functions, but there also seems to be a lack of consensus regarding the theoretical assumptions, and perhaps, even the goals of this procedure.

Biomechanics of the Brain will present an introduction to brain anatomy for engineers and scientists. Experimental techniques such as brain imaging and brain tissue mechanical property measurement will be discussed, as well as computational methods for neuroimage analysis and modeling of brain deformations due to impacts and neurosurgical interventions. Brain trauma between the different sexes will be analyzed. Applications will include prevention and diagnosis of traumatic injuries, such as shaken baby syndrome, neurosurgical simulation and neurosurgical guidance, as well as brain structural disease modeling for diagnosis and prognosis. This book will be the first book on brain biomechanics. It will provide a comprehensive source of information on this important field for students, researchers, and medical professionals in the fields of computer-aided neurosurgery, head injury, and basic biomechanics.