Table 1.

The classification of hemorrhagic transformation

Type	Description
HI1	Small hypointensity petechiae
HI2	More confluent hypointensity throughout the infarct zone without mass effect
PH1	Homogeneous hypointensity occupying <30% of the infarct zone, some mass effect
PH2	Homogeneous hypointensity occupying >30% of the infarct zone, significant mass effect. Or, any homogeneous hypointensity located beyond the borders of the infarct zone

HI1, hemorrhagic infarct type 1; HI2, hemorrhagic infarct type 2; PH1, parenchymal hematoma type 1; PH2, parenchymal hematoma type 2.