Table 2.
Houkin MRA score [16]
| Main artery | Findings | Score |
|---|---|---|
| ICA | Normal | 0 |
| Stenosis of C1 | 1 | |
| Discontinuity of C1 signal | 2 | |
| Invisible | 3 | |
| MCA | Normal | 0 |
| Stenosis of M1 | 1 | |
| Discontinuity of M1 | 2 | |
| Invisible | 3 | |
| ACA | Normal A2 and its distal signal | 0 |
| A2 and its distal signal decrease or loss | 1 | |
| Invisible | 2 | |
| PCA | Normal P2 and its distal signal | 0 |
| P2 and its distal signal decrease or loss | 1 | |
| Invisible | 2 | |
| Total | 0–10 |
ACA, anterior cerebral artery; ICA, internal carotid artery; MCA, middle cerebral artery; PCA, posterior cerebral artery.