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