Brain tumors
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Transcript of Brain tumors
![Page 1: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/1.jpg)
Brain Tumors
![Page 2: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/2.jpg)
Differential diagnosis
• Low grade astrocytoma• High grade astrocytoma (Glioblastoma)• Meningioma• Oligodendroma• Brain abscess• Lymphoma• Schwannomas
![Page 3: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/3.jpg)
High grade astrocytoma (Glioblastoma)
![Page 4: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/4.jpg)
Clues to diagnosis: Astrocytoma
• Heterogenous mass• often infiltrate into adjacent brain• rarely have the clear margins
![Page 5: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/5.jpg)
Oligodenroglioma
![Page 6: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/6.jpg)
Clues to diagnosis: Oligodendroglioma
• Evidence of calcification in 30% of cases.
![Page 7: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/7.jpg)
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).
![Page 8: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/8.jpg)
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
![Page 9: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/9.jpg)
Meningioma
![Page 10: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/10.jpg)
Clues to diagnosis: Meningioma
• Does not usually invade the brain• uniform contrast enhancement is essentially
diagnostic.• May have a dural tail.
![Page 11: Brain tumors](https://reader036.fdocuments.us/reader036/viewer/2022062511/54c22f154a7959a84b8b48d5/html5/thumbnails/11.jpg)
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)
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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.