Table 1. Definition of vessel injury score and inflammation score.

Score	Description of Injury
0	Internal elastic lamina intact; endothelium typically denuded; media compressed but not lacerated
1	Internal elastic lamina lacerated; media typically compressed but not lacerated
2	Internal elastic lacerated; media visibly lacerated; external elastic lamina intact but compressed
3	External elastic lamina lacerated; typically large lacerations of media extending through the external elastic lamina; coil wires sometimes residing in adventitia
Score	Description of Inflammation
0	< 25% struts with fewer than 10 inflammatory cells
1	Up to 25% struts with more than 10 inflammatory cells
2	25-50% struts with more than 10 inflammatory cells
3	> 50% struts with more than 10 inflammatory cells