On this occasion we look back on 25 years of the Deutsche Gesellschaft fur Neuro chirurgie. They hold a great deal: founding and development of the society, comple tion and extension, communication between the individual members and contacts to other societies beyond our borders. They also stand for close co-operation with those who transfer their patients to u- the neurologists and specialists in internal medicine, the ophthalmologists and ear nose-and throat specialists as well as the general surgeons. This 25th annual meeting will deal with two examples of diseases that present common problems to the neurologist and to the neurosurgeon, namely meningiomas and multiple sclerosis. In view of their long histories often going back over many years, both of these lesions lead to diagnostic errors and indequate treatment. And yet it should be possible to recognize meningiomas at an early date and to initiate the only possible treatment, the operation,if all diagnostic measures are repeatedly carried out. The diagnosis MS, on the other hand, with the multiplicity of symptoms which are peculiar to this disease, should continue to be re-examined until every other lesion has been excluded with certainty. The increasing number of legal proceedings because of diagnostic and therapeutic measures as well as the doctor-patient talk preceding the written consent for these measures are further problems in need of discussion. For this reason, the topic "medical liability in special reference to the neurosurgeon" was chosen for this meeting. Many questions necessitate many answers.

Meningiomas

Diagnostic and Therapeutic Problems
Meningiomas and their Problems: A Neuropathologist's Remarks
Malignant Meningiomas
Ultrastructure of Malignant Meningioma and Meningosarcoma
Unusual Course of Surgically Treated Intracranial Meningiomas, with Special Reference to their Malignant Degeneration
Mass Movements in Brain Tumors - Tissue Culture Investigation with Time Lapse Cinematography
On the Course of the Disease of Intracranial Meningioma
The Clinical Picture of the Meningiomas from the Neurosurgical Viewpoint
Eleven Cases of Multiple Meningiomas
Multiple Meningiomas
Multiple Meningiomas
The Suprasellar Meningioma
Meningiomas of the Sellar Region
Microsurgery of Suprasellar Meningiomas
Diagnostical and Clinical Appearence of the Sphenoidal Ridge Meningioma en Plaque
Problems in the Treatment of Basal Meningiomas
"Micromeningiomas" of Cavum Meckeli
Meningioma of the Middle Cranial Fossa and Epidermoid of the Clivus and Cerebellopontine Angle in the Same Patient
Meningiomas of the Left (Dominant) Temporal Region - Catamneses
Recidivation and Possibilities of Surgery in Meningiomas of the Middle and Posterior Third of the Longitudinal Sinus
Tentorial Meningiomas
Meningiomas of the Posterior Fossa - Disturbances of CSF Circulation and Brain Stem Functions
Meningiomas in Childhood
Multiple Sclerosis
Misdiagnosis
Neuropathology of Multiple Sclerosis
Neurological Aspects of False Diagnosis and Failure to Diagnose Multiple Sclerosis
Cerebrospinal Fluid in Multiple Sclerosis and Its Clinical Diagnostic Value
Neurophysiological Examination (SEP) for the Objective Diagnosis of Spinal Lesions
Misdiagnosis - Cerebral Form of Multiple Sclerosis
Multiple Sclerosis and Other Misdiagnosis in SpinalProcesses
Reasons for the Non-Recognition of Tumors of the Spinal Cord
Unfavorable Effects of Lumbar Puncture and Other Diagnostic Procedures on the Course of Multiple Sclerosis?
The Periadventitial Brain Sarcoma: A Simulator of Multiple Sclerosis
Multiple Sclerosis as Misdiagnosis - Neurophysiological Investigations for an Objective Diagnosis of Spino-Cervical Processes
Report on 373 Patients Operated on for Meningiomas (from June 1, 1951 to December 31, 1973)
Review on 101 Meningiomas (1965-1973)
A Structural Study of Ossification and Calcification in Meningiomas
Alterations in the Bone Structure of the Skull as a Differential Diagnostic Indication of Meningioma
Osteomas and Meningiomas
Possibilities and Limitations of Scintigraphy in Meningiomas
Value of Joint Neuroradiological and Angioscintigraphical Investigation of Meningiomas
Angiographic Aspects in Parasagittal Meningiomas
Angiographic Aspects in Meningiomas of the Posterior Cranial Fossa
Intra- and Postoperative Consequences Resulting from the Postoperative Tendency to CSF-Hypotension after Meningioma Removal
Post-Operative Rehabilitation of Patients with Sphenoid Bone Meningiomas
Cliniconeurological Development of Spinal Lesions under Hyperbaric Oxygenation Treatment (HO)
Electromyographic Surveillance of Hyperbaric Oxygenation Treatment (HO) of Spinal Lesions
Forensic Problems in Neurosurgery
The Doctor's Liability in the Field of Neurosurgery
Malpractice Liability in Neurosurgery
Concerning Legal Responsibility in Neurosurgical Intensive Care Units
Free Communications
Commission of Penal Offences and Cerebral Tumors
The Central Action of Free Serotonin on Blood Brain-Barrier and Regulation of Autonomic Functions
Amplitude Analysis of Long-TermIntracranial Pressure Recordings
Pressure Drop and Vascular Resistance in Cerebral Circulation
Intracerebral Transplantation of Chemically Induced Gliomas in Rats - A Brain Tumor Model in Animal Experiment
Causes of Stenoses and Embolic Occlusions in Microsurgical Anastomosis (Experimental Study)
Hormone Concentrations in Patients with Pituitary Tumors in the Postoperative Period with Regard to Hormone Replacement Therapy
Pre- and Postoperative Changes in Blood Perfusion of the Muscle of the Lower Extremities in Patients with a Lumbar Disc Prolapse
Problems of Hospitalism in Neurosurgical Intensive Care
The Influence of Antibiotics on the Development, Clinic and Treatment of Brain Abscess
A Simplified Procedure and a New Equipment for Stereotaxic Brain Operations
Is the Automatic Midline Determination with the Midliner Really an Improvement in Ultrasound Diagnosis? - A Comparative Investigation of 1889 Cases
Results of Two-Dimensional Ultrasonic Examination in Supratentorial Space-Occupying Lesions
The Diagnostic and Prognostic Significance of Qualitative and Quantitative Isotope Cisternography after Subarachnoid Hemorrhage
Electromyography and Electroneurography in the Appraisal of Peripheral Nerve Lesions
Recovery of the Median Nerve in the Carpal Tunnel Syndrome - Electroneurographic Studies after Surgery and Local Corticosteroid Injections in 71 Cases
Arteriosclerotic Alterations of the Superficial Temporal Artery in Severe General Sclerosis
Tuberculous Abscess Formation in the Spinal Canal
Rudimentary Occipital Cephaloceles
The Armoured Aneurysm Thread: A New Aid for the Surgical Treatment of Intracranial Aneurysms (With Technical and Clinical Notes)
Longitudinal Myelotomy - Indications and Results
The Treatment ofSpasticity by Foerster's Operation
Plastic Surgery in Bone Defects of the Posterior Orbital Cavity Using Palacos
Plastic Repair of Major Dura and Bone Defects by the Use of Lyophilized Dura and Autopolymerizing Acryl Derivatives (Palacos) in a Single Session
Experience with Meningiomas in the Posterior Fossa
Meningiomas and Neighboring Structures
Scenes of Stone Cutting from the 16th and 17th Century.