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Capillary telangiectasia has mild contrast material enhancement but is otherwise undetectable on conventional MR images. It lacks the "hemosiderin rim" of cavernous angioma and demonstrates increased susceptibility only on GRE images, likely owing to blood oxygen-level-dependent contrast. GRE is essential in diagnosing brain capillary telangiectasia, which could otherwise be misdiagnosed as neoplasia, subacute infarction, or demyelination.

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