The report which follows constitutes the proceedings of a sym posium on the classification of brain tumours held in Cologne in 1961. It contains the contributions and discussions reported as far' as possible in a word-for-word manner, in the hope not only of providing out of the thoughts of the participants stimulation for further research, but also to indicate the atmosphere which prevailed during the symposium in which many completely opposed views were able to be expressed without any feeling of embarrassment. This freedom of expression is already obvious in the discussion of a proposed classification of brain tumours for the Unio Internationalis Contra Cancrum (UICC). The symposium endeavoured here to pro duce a positive criticism in order to arrive at a significant and practical conclusion viz a general, internationally acceptable classi fication. It was necessary to accept a degree of compromise even if the classification suggested did not in every point correspond to all the personal views of the various participants. The second part of the symposium was concerned with a critical discussion of numerous brain tumour problems, for example the scientific delineation of tumour groups; the discussion was started by general reviews on the biology of brain tumours so that the later discussion could cover as wide a ground as possibly. Here also we all felt that a great stimulus for future work arose from the discussion.

Klappentext

The report which follows constitutes the proceedings of a sym­ posium on the classification of brain tumours held in Cologne in 1961. It contains the contributions and discussions reported as far' as possible in a word-for-word manner, in the hope not only of providing out of the thoughts of the participants stimulation for further research, but also to indicate the atmosphere which prevailed during the symposium in which many completely opposed views were able to be expressed without any feeling of embarrassment. This freedom of expression is already obvious in the discussion of a proposed classification of brain tumours for the Unio Internationalis Contra Cancrum (UICC). The symposium endeavoured here to pro­ duce a positive criticism in order to arrive at a significant and practical conclusion viz a general, internationally acceptable classi­ fication. It was necessary to accept a degree of compromise even if the classification suggested did not in every point correspond to all the personal views of the various participants. The second part of the symposium was concerned with a critical discussion of numerous brain tumour problems, for example the scientific delineation of tumour groups; the discussion was started by general reviews on the biology of brain tumours so that the later discussion could cover as wide a ground as possibly. Here also we all felt that a great stimulus for future work arose from the discussion.

Inhalt
The Classification of Brain Tumours.- I. Classification of Brain Tumours a) General Remarks on Classification.- The Nomenclature of Tumours of the Nervous System.- b) The Contribution of Different Tech niques to Classification.- 1. Genetics: The Genetics of Cerebral Tumours.- 2. Cerebral Tumours in Animals: A Comparative Study of Neoplasms of the Central Nervous System in Animal.- 3. Experimental Production of Brain Tumours: Experimental Induction and Transplantation of Brain Tumours in Animals.- Morphology of Experimental Brain Tumours.- 4. Tissue Culture: Tissue Culture and the Classification of Brain Tumours.- 5. Electron Microscopy: Remarks on the Electronmicroscopical Appearances of Brain Tumours.- 6. Histochemistry: Remarks on the Histochemistry of Brain Tumours.- 7. Metallic Impregnation: Observations on the Metallic Impregnations of Brain Tumours.- II. The Malignancy and Grading of Tumours.- The System of Grading of Gliomas.- Grading of Malignancy of Brain Tumours.- III. Spongioblastoma.- Some Remarks on the Spongioblastoma of the Brain.- Discussion on Polar Spongioblastomas.- IV. Polymorphous Oligodendroglioma.- Morphological Problems of Brain Tumours with Mixed Cell Population.- On the Definition of the Polymorphous Oligodendroglioma.- Oligodendrogliomas in Animals.- V. Sarcoma and Related Processes.- Primary Sarcomas of the Brain.- On the Primary Sarcomas of the Brain.- The Classification and Diagnosis of Intracranial Sarcomas.- Microgliomatosis.- List of the Participants.