A. Advances.- The Overdrained Hydrocephalus. Clinical Manifestations and Management.- I. Introduction.- II. Theoretical Considerations.- III. Clinical Manifestations.- 1. Acute Decompression.- 2. Microcrania, Craniostenosis.- 3. Slit Ventricles.- 4. Intolerance of CSF Pressure Elevation, Shunt Dependency.- 5. Subdural Haematoma.- 6. Low Pressure Headaches.- IV. Management of Overdrainage Symptoms.- V. Prevention of Overdrainage.- 1. The Role of Valvular Closing Pressure in the Origin of Overdrainage.- 2. Specially Designed Valves and Devices for Preventing Post-Shunt Overdrainage.- VI. Future Perspectives.- VII. Conclusions.- References.- Intravascular Occlusion of Saccular Aneurysms of the Cerebral Arteries by Means of a Detachable Balloon Catheter.- I. Introduction.- II. Making and Construction of the Detachable Balloon Catheter.- III. Detachable Balloon Catheter Technique in Saccular Aneurysms of the Cerebral Arteries.- IV. Material and Methods.- V. Indication for Surgery.- VI. Preoperative Care and the Operation.- 1. Preoperative Care.- 2. The Operation.- 2.1. Introduction of Balloon Catheters into the Aneurysm.- 2.2. Temporary and Permanent Occlusion of Aneurysms by Means of the Detachable Balloon Catheter.- 2.3. Complications.- VII. Results of Intravascular Operations for Saccular Aneurysms of the Cerebral Arteries.- Conclusion.- Acknowledgements.- References.- Advances in Computerized Tomography.- 1. Examination Techniques.- 2. Cerebral CT.- 2.1. Differential Diagnosis Concerning Diffuse Hypodense Changes in the Parenchyma.- 2.2. Orbital Processes.- 2.3. Sellar Processes.- 2.4. Processes in the Petrous Portion of the Temporal Bone and the Cerebellopontine Angle Area.- 2.5. Blood-Vessel Malformations.- 3. Body-CT.- 3.1. Spinal Processes.- 3.2. Neurogenic and Myopathie Muscle Atrophy.- References.- B.Technical Standards.- Surgical Approaches to the Tentorial Hiatus.- Pre-operative Management.- General.- Antibiotic Cover.- Anaesthesia.- The Use of c.s.f. Drainage.- The Anterior Temporal Approach.- The Extended Anterior Temporal Approach with Anterior Temporal Lobectomy.- The Subtemporal Approach to the Tentorial Hiatus.- The Combined Supra-and Infratentorial Approach to the Lateral Aspect of the Tentorial Hiatus.- Essential Preliminary Investigations.- Positioning the Patient.- The Incision.- Opening the Dura.- Closure.- The Posterior Tentorial Hiatus.- The Occipital Approach to the Posterior Part of the Tentorial Hiatus — the Preferred Approach to the Pineal Region.- Positioning the Patient.- The Incision.- Closure.- The Subtentorial Approach to the Tentorial Hiatus.- Acknowledgements.- References.- Management of Chronic Subdural Haematomas and Hygromas.- Aetiology and Physiopathology.- Clinical Symptoms.- Diagnostic Procedures.- Treatment.- Conservative Treatment.- Operative Treatment.- Technique of Burr Hole Evacuation.- Peritoneal Drainage of Subdural Hygromas.- Haematoma Capsule Resection by Formal Craniotomy.- Technique of Operative Reduction of Skull Size.- Complications.- Results.- In Children.- In Adults.- Summary.- References.- Subdural Empyema.- Historical.- Cases in Present Study.- Incidence.- Etiology.- Traumatic.- As a Complication of Surgery.- As a Complication of Trauma.- Spontaneous.- As a Complication of Meningitis.- As a Complication of Paranasal Sinusitis.- As a Complication of Ear Disease.- Haematogenous Disease.- Method of Spread.- Presentation.- Diagnosis.- Transmission Computerised Axial Tomography.- Skull Radiographs and Angiography.- Radio-Nuclide Scanning.- Electroencephalography.- Differential Diagnosis.- Pre-Operative Management.- Airway.- Bacteriology and Antibiotics.- Fits.- Radiography and Anaesthesia.- Operations.- Exposure.- Exploratory.- Unilateral.- Bilateral.- Posterior fossa.- Dealing with the Empyema.- Second Craniotomies.- Surgery of Associated Lesions.- Otitic and Sinus Disease.- Osteomyelitis.- Epidural Abscess.- Cranioplasty.- Post-Operative Management.- Complications.- Necropsy Findings.- Mortality.- Morbidity.- Neurological Deficits.- Epilepsy.- Discussion.- Conclusions.- Acknowledgements.- References.- Author Index.