Cerebral microhemorrhage

Last revised by Dr Omar Giyab on 19 Apr 2021

Cerebral microhemorrhages, or cerebral microbleeds, are small focal intracerebral hemorrhages, often only visible on susceptibility-sensitive MRI sequences.

Cerebral microhemorrhages are only seen on MRI and are best seen on susceptibility weighted T2* sequences such as gradient-recalled echo (GRE) and susceptibility weighted imaging (SWI).

They appear as conspicuous 2-10 mm punctate regions of signal drop out with blooming artifact. This blooming grossly overestimates the size of the lesions, thus they are usually inapparent on other MRI sequences and CT.

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Cases and figures

  • Case 1: cerebral amyloid angiopathy
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  • Case 2: chronic hypertension
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  • Case 3: radiotherapy
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  • Case 4: cavernous malformations
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  • Case 5: cerebral fat embolism
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  • Case 6: diffuse axonal injury
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  • Case 7: progressive facial hemiatrophy
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