At the 8th European Congress of Neurosurgery, which took place in Barcelona, September 6-11, 1987, a great number of papers from all fields of neurosurgery were presented, reflecting the major advances that have been achieved in recent years. The Programme Committee of the European Association of Neurosurgical Societies has selected the highlights of the congress for publication. These contributions were carefully edited and compiled in two supplement volumes of Acta Neurochirurgica.

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I. Intraoperative and Posttraumatic Monitoring and Brain Protection.- Assessment of Reversible Cerebral Ischaemia in Man: Intraoperative Monitoring of the Somatosensory Evoked Response.- Monitoring of Brain Function by Means of Evoked Potentials in Cerebral Aneurysm Surgery.- Safety Limits of Controlled Hypotension in Humans.- Intraoperative Monitoring of the Motor Function: Experimental and Clinical Study.- Intraoperative Identification of the Central Sulcus: a Practical Method.- Intraoperative Monitoring of the Electrocochleogram and the Preservation of Hearing During Acoustic Neuroma Excision.- The Use of EEG Spectral Analysis After Thiopental Bolus in the Prognostic Evaluation of Comatose Patients with Brain Injuries.- Continuous versus Serial Global Cerebral Hemometabolic Monitoring: Applications in Acute Brain Trauma.- Cerebral Hemisphere Swelling in Severe Head Injury Patients.- II. Cerebro-vascular Lesions.- Italian Cooperative Study on Giant Intracranial Aneurysms: 1. Study Design and Clinical Data.- Italian Cooperative Study on Giant Intracranial Aneurysms: 2. Radiological Data.- Italian Cooperative Study on Giant Intracranial Aneurysms: 3. Modalities of Treatment.- Italian Cooperative Study on Giant Intracranial Aneurysms: 4. Results of Treatment.- Surgical Approach to Giant Aneurysms of the Anterior Circulation71.- The Microvascular Doppler an Intraoperative Tool for the Treatment of Large and Giant Aneurysm.- Cerebral Vasospasm After Subarachnoid Haemorrhage Investigated by Means of Transcranial Doppler Ultrasound.- Prostacyclin: a New Treatment of Vasospasm Associated with Subarachnoid Haemorrhage.- Treatment of Carotid-cavernous Fistulas by Embolization of the Cavernous Sinus Through Venous Affluents or Direct Puncture.- Surgical Management of LargeAVMs.- Non-invasive Follow-up of Patients with Intracranial Arteriovenous Malformations After Proton-beam Radiation Therapy.- 774 Carotid Endarterectomies for Strokes and Transient Ischaemic Attacks: Comparison of Results of Early vs. Late Surgery.- III. Intracranial Tumours.- Cystic Cranio-pharyngioma Treated by 90Yttrium Silicate Colloid.- Further Experiences in the Treatment of Cystic Craniopharyngeomas with Yttrium 90 Silicate Colloid.- Treatment and Recurrences in 135 Pituitary Adenomas.- Management and Surgical Outcome of Suprasellar Meningiomas.- Microsurgery of Midbrain Lesions.- Diagnosis and Treatment of Pineal Tumours. Kyoto University Experience (19411984).- Infratentorial Epidermoids.- Cystic Meningiomas.- Validity of Stereotactic Biopsy as a Diagnostic Tool.- Experiences with CT-guided Stereotaxic Biopsies in 121 Cases.- Pitfalls in Diagnostic Stereotactic Brain Surgery.- The Relevance of Pathological Diagnosis for Therapy and Outcome of Brain Stem Gliomas.- Serial Stereotactic Biopsy of Brain Stem Expanding Lesions. Considerations on 45 Consecutive Cases.- Stereotactic Biopsy and Treatment of Brain Stem Lesions: Combined Study of 33 Cases (Bologna-Marseille).- Brain Stem Expansive Lesions: Stereotactic Biopsy for a Better Therapeutic Approach.- Experience of Boron-neutron Capture Therapy for Malignant Brain Tumours with Special Reference to the Problems of Postoperative CT Follow-ups.- Radiosurgery in Cerebral Tumours and AVM.- IV. Benign Intracranial Cystic Lesions, Hydrocephalus, CSF-Volumes.- Arachnoid Cysts of the Middle Cranial Fossa: Experience with 77 Cases Treated Surgically.- Intracranial Arachnoid Cysts in Adults.- Arachnoid Cysts of the Middle Fossa Predispose to Subdural Haematoma Formation Fact or Fiction?.- Clinical andNeuropsychological Results After Operative and Conservative Treatment of Arachnoidal Cysts of the Perisylvian Region.- Cerebral Scintigraphy with 111indium Oxine-Labelled Leukocytes in the Differential Diagnosis of Intracerebral Cystic Lesions.- RISA Cisternography in the Option of Ventriculocisternal Shunt for Infantile Non-tumoural Aqueductal Stenosis.- Intracranial CSF Volumes: Natural Variations and Physiological Changes Measured by MRI.- V. Central Pain Syndromes.- Thalamic Pain and Stereotactic Mesencephalotomy.- Stimulation of Internal Capsule, Thalamic Sensory Nucleus (VPM) and Cerebral Cortex Inhibited Deafferentation Hyperactivity Provoked After Gasserian Ganglionectomy in Cat.- The Tolosa-Hunt Syndrome: a Problem in Differential Diagnosis.