Abstract
The 4th edition of the WHO (World Health Organization) classification of tumours of the central nervous system published in 2007 provides several new entities, new variants of established entities as well as changes in the tumour grading system. In addition, new molecular markers are introduced and information about the genetic bases of brain tumour development is extended. This review gives an overview about the current WHO classification system, discusses remaining controversies and provides an introduction of the standard diagnostic procedures.
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