Classification
type I: subacute hemorrhage
T1: hyperintense
T2: hypo or hyperintense
type II: most common type - classic "popcorn" lesion
T1: mixed signal intensity centrally
T2: mixed signal intensity centrally
low signal rim with blooming on T2* sequences
type III: chronic hemorrhage
T1: hypointense to isointense centrally
T2: hypointense centrally
low signal rim with blooming on T2* sequences
type IV: multiple punctate microhemorrhages
T1: difficult to identify
T2: difficult to identify
T2* Gradient Echo: "black dots" with blooming
difficult to distinguish from small capillary telangiectasias