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Brain Stem Glioma




Focal Tumors

Focal tumors are defined as:

  • Involving less than 50% of the afflicted anatomical structure or
  • Less than 2 cm in maximum diameter 
  • Imaging:
    • Well-circumscribed
    • Absence of hypodensity 


There are three regions where these focal tumors can be found:

1. Pons

2. Tectum of the midbrain

3. At the cervicomedullary junction

  • Most commonly involve the midbrain and medulla.
  • Usual pathology is juvenile pilocytic astrocytoma (WHO grade I).


MR scan below shows a dorsally exophytic tumor (1) of the brain stem




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