Cerebral microhemorrhage

Last revised by Dr Rohit Sharma on 11 Oct 2022

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 only seen on susceptibility weighted T2* sequences such as gradient-recalled echo (GRE) and susceptibility weighted imaging (SWI) 24.

They appear as conspicuous 2-10 mm punctate regions of signal drop out with blooming artifact 24. This blooming grossly overestimates the size of the lesions, thus they are usually inapparent on other MRI sequences and CT 24.

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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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  • Case 8: hypoxia and critical illness
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  • Case 9: CADASIL
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  • Case 10: PRES
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  • Case 11: amyloid-related imaging abnormalities
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