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II./3.5.: Take home messages
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- Contrast enhancement of extraaxial tumors is usually strong (no blood-brain barrier).
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- Signal of primary brain tumors is usually low on T1 weighted, and high on T2 weighted images.
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- Hypercellular tumors, especially those with a cell content of large nuclei, have low signal on T2 weighted images.
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- Inside the fluids, the Brown motion related diffusion is free, therefore, there is no signal increase on DWI images.
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- Perfusion (tissue devolution) depends on the vascularisation of the tumor.
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Last modified: Friday, 23 August 2013, 5:20 PM