In early 1987, I was approached by Professor Klaus Joachim Zülch, with a proposal that I convene at an early date a meeting in Houston, Texas, for the purpose of considering recent research developments that might have an influence on the classification of brain tumors. It was further considered that a review of this nature might ultimately necessitate revision of the WHO “Blue Book” ofHistological Typing of Tumours of the Central Nervous System.Among the group which met in Houston in March 1988 were members of the original Collaborating Centre who were still active and other neuropathologists from around the world who had expertise in these mat
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