Table 2.
Synovial Membrane Scoring System
| Intimal hyperplasia | |
| 1 to 2 layers only | 0 |
| 3 to 4 layers, focal | 1 |
| 5 or more layers, focal | 2 |
| 5 or more layers, diffuse | 3 |
| Lymphocytic/plasmocytic infiltration | |
| None | 0 |
| 1 focus of infiltration | 1 |
| 2 to 5 foci of infiltration | 2 |
| Diffuse infiltration or >5 loci | 3 |
| Subintimal fibrosis | |
| None | 0 |
| Light focal collagenous staining | 1 |
| Heavy focal collagenous staining | 2 |
| Heavy diffuse collagenous staining | 3 |
| Vascularity | |
| 0 to 2 vascular elements | 0 |
| 3 to 4 vascular elements | 1 |
| 5 to 8 vascular elements | 2 |
| More than 8 vascular elements | 3 |