page_title: WHO classification of tumours of the central nervous system
hierarchical_section_title: WHO classification of tumours of the central nervous system
caption_attribution_description: MRI of brain. (A) Initial MRI on February 16, 2005, shows a tumor in the right and left frontal lobe as well as the right thalamus. (B) MRI after surgery, radiation and chemotherapy. The tumor has completely disappeared except for slight enhancement adjacent to the surgical margin. (C) Recurrence of the thalamic tumor despite maintenance chemotherapy on November 16, 2005. (D) Increase in size of the thalamic tumor two months after stereotactic radiotherapy. (E) After 6 cycles of TMZ therapy, the thalamic lesion enlarged, and the patient developed dysarthria and hemiparesis. (F) After 2 courses of treatment with interferon-beta and TMZ, the tumor shows a partial response.
context_page_description: The following is a simplified version of the last 2007 WHO classification of the tumours of the central nervous system.
  Currently, as of 2016, clinicians are using revised WHO grade 4th edition which incorporates recent advance in molecular pathology. The 4th revised edition, as the name implies, will soon be updated to catch up ever growing knowledge of this field.
  Listed for each tumour are the WHO official name, the ICD-O code, and with Roman numeral the WHO Grade.
context_section_description: The following is a simplified (deprecated) version of the last 2007 WHO classification of the tumours of the central nervous system. 
   Currently, as of 2016, clinicians are using revised WHO grade 4th edition which incorporates recent advance in molecular pathology. The 4th revised edition, as the name implies, will soon be updated to catch up ever growing knowledge of this field.
  Listed for each tumour are the WHO official name, the ICD-O code (with Arabic numeral, where /0 indicates "benign" tumour, /3 malignant tumour and /1 borderline tumour), and with Roman numeral the WHO Grade (a parameter connected with the "aggressiveness" of the tumour).
caption: MRI of a patient with anaplastic astrocytoma
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