This volume contains 110 representative works on hydrocephalus which are collected from 26 listed journals and books in the field of neuroscience published in 1986. We express our sincere thanks to all authors, listed publishers and editorial boards for their cooperation and permission on this publication. It isour pleasure if this 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 Cytologica: The International Academy of Cytology Acta Neurochirurgica: Springer-Verlag Acta Neurochirurgica: Springer-Verlag, Wein Acta Neurologica Scandinavica: Munksgaard International Publishers Ltd. Acta Neuropathologica: Springer-Verlag, Heidelberg American Journal of Neuroradiology (AJNR): American Roentgen Ray Society Annals of Neurology: American Neurological Association Annual Report of the Research Committee of "Hydrocephalus," The Ministryof Health and Welfare of Japan, 1986: Neuron Publishing Co. Archives of Neurology: American Medical Association Brain and Development: (Official Journal of The Japanese Society of Child Neurology) British Journal of Obstetrics and Gynaecology: Blackwell Scientific Publications Ltd. Child''s Nervous System: Springer-Verlag, Berlin CT Kenkyu/Progress in Computerized Tomography: Neuron Publishing Co. Journal of Computer Assisted Tomography: Raven Press, New York 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. Journal of Ultrasound in Medicine: American Institute of Ultrasound in Medicine Neuropediatrics: Hippokrates Verlag GmbH Neurosurgery: The Congress of Neurological Surgeons, Inc.