Intracerebral metastases MRI: Difference between revisions
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==Overview== | |||
==MRI== | |||
'''T1W:''' Typically iso to hypointense mass, however melanoma metastases are an exception to this rule (hyperintense due to the paramagnetic properties of melanin). | |||
'''T2W:''' Typically hyperintense. If metastases are scattered the pattern may mimic vascular disease. | |||
'''FLAIR:''' Typically hyperintense with hyperintense peritumoral edema. | |||
'''T1 C+:''' The enhancement pattern can be uniform, punctuate, or ring-enhanced, but it is usually intense. Delayed sequences may show additional lesions, therefore contrast-enhance MR is the current standard for small met detection. | |||
'''MRS:''' Intratumoral choline peak with no choline elevation in the peritumoral edema. Any tumor necrosis results in a lipid peak. | |||
'''DWI:''' edema is out of proportion with tumour size and appears dark on trace-weighted DWI. | |||
Nuclear medicine | |||
==References== | ==References== | ||
Revision as of 14:40, 12 September 2012
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Intracerebral metastases Microchapters |
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Differentiating Intracerebral Metastases from other Diseases |
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Diagnosis |
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Treatment |
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Case Studies |
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Intracerebral metastases MRI On the Web |
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American Roentgen Ray Society Images of Intracerebral metastases MRI |
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Risk calculators and risk factors for Intracerebral metastases MRI |
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Overview
MRI
T1W: Typically iso to hypointense mass, however melanoma metastases are an exception to this rule (hyperintense due to the paramagnetic properties of melanin).
T2W: Typically hyperintense. If metastases are scattered the pattern may mimic vascular disease.
FLAIR: Typically hyperintense with hyperintense peritumoral edema.
T1 C+: The enhancement pattern can be uniform, punctuate, or ring-enhanced, but it is usually intense. Delayed sequences may show additional lesions, therefore contrast-enhance MR is the current standard for small met detection.
MRS: Intratumoral choline peak with no choline elevation in the peritumoral edema. Any tumor necrosis results in a lipid peak.
DWI: edema is out of proportion with tumour size and appears dark on trace-weighted DWI. Nuclear medicine