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Brain tumors
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  • 1. Brain Tumors
  • 2. Differential diagnosis
    • Low grade astrocytoma
    • High grade astrocytoma (Glioblastoma)
    • Meningioma
    • Oligodendroma
    • Brain abscess
    • Lymphoma
    • Schwannomas
  • 3. High grade astrocytoma (Glioblastoma)
  • 4. Clues to diagnosis: Astrocytoma
    • Heterogenous mass
    • often infiltrate into adjacent brain
    • rarely have the clear margins
  • 5. Oligodenroglioma
  • 6. Clues to diagnosis: Oligodendroglioma
    • Evidence of calcification in 30% of cases.
  • 7. CNS lymphoma Proton density–weighted MR image through the temporal lobe demonstrates a low signal intensity nodule ( small arrows ) surrounded by a ring of high signal intensity edema ( larger arrows ).
  • 8. T1-weighted contrast-enhanced axial MRI demonstrates ring enhancement surrounded by a nonenhanced rim of edema. In this patient with AIDS, a solitary lesion of this type is consistent with either lymphoma or toxoplasmosis; the presence of multiple lesions favors toxoplasmosis
  • 9. Meningioma
  • 10. Clues to diagnosis: Meningioma
    • Does not usually invade the brain
    • uniform contrast enhancement is essentially diagnostic.
    • May have a dural tail.
  • 11. Schwannomas Axial noncontrast MR scan through the cerebellopontine angle demonstrates an extraaxial mass that extends into a widened internal auditory canal, displacing the pons ( arrows )
  • 12. Schwannoma Postcontrast T1-weighted image demonstrates intense enhancement of the vestibular schwannoma ( white arrow ). Abnormal enhancement of the left fifth nerve ( black arrow ) most likely represents another schwannoma in this patient with neurofibromatosis type 2.