Diagnostic Criteria of Hemorrhage in MRI of the Brain

The imaging characteristics of blood on MRI can be variable:

Age

T1 Weighted

T2 Weighted

Hyperacute

Hours old, mainly oxyhemoglobin with surrounding edema

Hypointense

Hyperintense

Acute

Days old, mainly deoxyhemoglobin with surrounding edema

Hypointense

Hypointense, surrounded by hyperintense margin

Subacute

Weeks old, mainly methemoglobin

Hyperintense

Hypointense, early subacute with predominantly intracellular methemoglobin. Hyperintense, late subacute with predominantly extracellular methemoglobin

Chronic

Years old, hemosiderin slit or hemosiderin margin surrounding fluid cavity

Hypointense

Hypointense slit, or hypointense margin surrounding hyperintense fluid cavity

 

 

References:

  1. Culebras A, Kase CS, Masdeu JC, Fox AJ, Bryan RN, Grossman CB, Lee DH, Adams HP, Thies W. Practice guidelines for the use of imaging in transient ischemic attacks and acute stroke. A report of the Stroke Council, American Heart Association. Stroke. 1997 Jul;28(7):1480-97. [Medline]

Created: April 19, 2005
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