Brain tumors

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Brain tumors

  1. 1. Brain Tumors
  2. 2. Differential diagnosis <ul><li>Low grade astrocytoma </li></ul><ul><li>High grade astrocytoma (Glioblastoma) </li></ul><ul><li>Meningioma </li></ul><ul><li>Oligodendroma </li></ul><ul><li>Brain abscess </li></ul><ul><li>Lymphoma </li></ul><ul><li>Schwannomas </li></ul>
  3. 3. High grade astrocytoma (Glioblastoma)
  4. 4. Clues to diagnosis: Astrocytoma <ul><li>Heterogenous mass </li></ul><ul><li>often infiltrate into adjacent brain </li></ul><ul><li>rarely have the clear margins </li></ul>
  5. 5. Oligodenroglioma
  6. 6. Clues to diagnosis: Oligodendroglioma <ul><li>Evidence of calcification in 30% of cases. </li></ul>
  7. 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. 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. 9. Meningioma
  10. 10. Clues to diagnosis: Meningioma <ul><li>Does not usually invade the brain </li></ul><ul><li>uniform contrast enhancement is essentially diagnostic. </li></ul><ul><li>May have a dural tail. </li></ul>
  11. 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. 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.

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