[1] The books lists ICD-O codes, CNS WHO grades and describes epidemiological, clinical, macroscopic and histopathological features, among others.
The 5th WHO classification delineates distinct types of tumors, some of them being further divided into subtypes, rendering the former terms entity and variant obsolete.
[3] Kleihues P, Burger PC, Scheithauer BW (eds) (1993) Histological typing of tumours of the central nervous system.
Springer, Heidelberg Kleihues P, Cavenee WK (eds) (2000) World Health Organization Classification of Tumours.
The 5th edition[2] incorporated many of the proposed changes outlined by the cIMPACT-NOW (the Consortium to Inform Molecular and Practical Approaches to CNS Tumor Taxonomy - Not Official WHO).