Intracerebral metastases MRI

Intracerebral metastases Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Sujit Routray, M.D. [2]

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

Gallery

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  _{Brain metastasis in the right cerebral hemisphere from lung cancer shown on T1-weighted magnetic resonance imaging with intravenous contrast.}

References

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