18. Glioma involving most of the left parietal lobe – seen to the right on this axial CT scan (arrow). The appearance is of a cystic tumor, but biopsy and histological confirmation are necessary to be certain of its nature.
19. Cystic glioblastoma of the brain stem (arrowed), clearly demonstrated by MRI. The sagittal section shows that the tumor involves the posterior part of the brainstem and extends into the cerebellum.
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21. Meningioma in the occipital lobe , as revealed on contrast-enhanced CT scan. The patient presented with a contralateral homonymous hemianopia.
22. CT scan showing a right frontal meningioma with a vascular capsule . The contrast-enhancement technique used in this scan demonstrates the classic appearance of a densely enhancing, sharply marginated tumor, tightly against the dura.
23. MRI picture of a right frontal meningioma (same patient as in slide 21). MRI shows the fissures of the brain more clearly than CT; it shows the tumor well, and parts of its vascular supply appear as hypodense images (arrows).
24. MRI sagitttal view of the patient seen in slides 21 and 22 . This view demonstrates the relationship of the meningioma to the dura and skull very clearly, and shows the vascular capsule posteriorly (arrow).
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30. Multiple cerebral metastases in a patient with carcinoma of the breast , demonstrated on CT scan. Axial ‘cuts’ at other levels in the brain demonstrated further lesions.
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34. Subdural lipoma demonstrated by MRI in sagittal section. The lipoma (large arrows) is severely compressing the spinal cord (small arrows).
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