Figure 15 Disruption of the BBB in vasogenic edema associated with a glioma appears hyperintense on gadolinium-enhanced MRI (a). Peritumoral vasogenic edema is demonstrated by hyperintensity on T2-weighted sequences (b) and ADC maps (c).

be avoided by keeping the head in midline position. Prevention of increased intracranial venous pressure may be achieved if the head of the bed is placed at an angle of 30°, although greater angles may theoretically compromise CPP.

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