Distribution of occlusive disease for each arterial segmenta
| Circulation | Ischemic territory | Subtotal Ischemic | All Abnormalities (Related to Ischemia or Not) | No Relevant Abnormalities | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Segments | Occlusion | Stenosis | Occlusion or Stenosis | Occlusion or Stenosis | ||||||
| Extracranial abnormalities per segment in 2209 patients (n = 50,807 segments) | ||||||||||
| Extracranial ICA or CCA | 207 | 4.7% | 167 | 3.8% | 374 | 8.5% | 520 | 11.8% | 3898 | 88.2% |
| V1–3 | 59 | 1.3% | 29 | 0.7% | 88 | 2.0% | 160 | 3.6% | 4258 | 96.4% |
| Subtotal extracranial | 266 | 3.0% | 196 | 2.2% | 462 | 5.2% | 680 | 7.7% | 8156 | 92.3% |
| Intracranial abnormalities per segment | ||||||||||
| Carotid siphon without T | 85 | 1.9% | 47 | 1.1% | 132 | 3.0% | 172 | 3.9% | 4246 | 96.1% |
| Carotid siphon with T | 124 | 2.8% | — | 0.0% | 124 | 2.8% | 125 | 2.8% | 4293 | 97.2% |
| MCA: M1 | 405 | 9.2% | 54 | 1.2% | 457 | 10.3% | 480 | 10.9% | 3938 | 89.1% |
| MCA: M2–3 only | 226 | 5.1% | 42 | 1.0% | 268 | 6.1% | 279 | 6.3% | 4139 | 93.7% |
| ACA: A1 | 104 | 2.4% | 11 | 0.3% | 115 | 2.6% | 130 | 2.9% | 4288 | 97.1% |
| ACA: A2–3 only | 9 | 0.2% | 3 | 0.1% | 12 | 0.3% | 14 | 0.3% | 4404 | 99.7% |
| Subtotal anterior intracranial | 953 | 3.6% | 157 | 0.6% | 1108 | 4.2% | 1200 | 4.5% | 25,308 | 95.5% |
| PCA: P1 | 41 | 0.9% | 10 | 0.2% | 51 | 1.2% | 71 | 1.6% | 4347 | 98.4% |
| PCA: P2–3 only | 33 | 0.8% | 13 | 0.3% | 46 | 1.0% | 64 | 1.5% | 4354 | 98.6% |
| V4 | 73 | 1.7% | 30 | 0.7% | 103 | 2.3% | 148 | 3.4% | 4270 | 96.7% |
| BA | 55 | 2.5% | 26 | 1.2% | 81 | 3.7% | 96 | 4.4% | 2113 | 95.7% |
| Subtotal posterior intracranial | 202 | 1.3% | 79 | 0.5% | 281 | 1.8% | 379 | 2.5% | 15,084 | 97.6% |
| Subtotal intracranial | 1155 | 2.8% | 236 | 0.7% | 1389 | 3.3% | 1579 | 3.8% | 40,392 | 96.2% |
| Subtotal anterior circulation | 1160 | 3.8% | 324 | 1.0% | 1482 | 4.8% | 1720 | 5.6% | 29,206 | 94.4% |
| Subtotal posterior circulation | 261 | 1.3% | 108 | 0.5% | 369 | 1.9% | 539 | 2.7% | 19,342 | 97.3% |
| Total extra- and intracranial abnormalities per segment | 1421 | 2.8% | 432 | 0.9% | 1851 | 3.6% | 2259 | 4.5% | 48,548 | 95.5% |
Note:—ACA indicates anterior cerebral artery; PCA, posterior cerebral artery; BA, basilar artery; CCA, common carotid artery.
↵a For each arterial segment, numbers and rates are given. Subtotal and total rates are calculated by dividing by all segments in the subtotal/total. A single patient may have several pathologic arterial segments.