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Brain Tumors (Meningioma (convexities of cerebral hemispheres and…

- - - - clear cell and chorid varants
    - - papillary and rhabdoid varaints
- - - - acoustic neuroma
        
        third most common primary intracranial neoplasm #
      - acoustic schwannoma
  - - - interlacing bundles of elongated cells with palisading nuclei
    - - looser, less cellular pattern
- - - - peak occurrence in late middle-age group
      - marked anaplasia and pleomorphism
      - most common primary intracranial malignancy
      - pronounced vascular changes and endothelial hyperplasia
      - areas of necrosis surrounded by "pseudopalisade" arrangement #
      - cerebral hemispheres #
      - highly malignant