Prevalence of early comuted tomographic signs and their association with the site of arterial occlusion
| Sign | n | Prevalence | ICA (n=29) | M1 (n=34) | Branch (n=38) | No occlusion (n=4) |
|---|---|---|---|---|---|---|
| Percentages in parentheses indicate sensitivity of early CT sign in each arterial occlusion group. | ||||||
| ALN, attenuation of the lentiform nucleus; branch, middle cerebral artery branch occlusion; CT, computed tomography; HMCAS, hyperdense middle cerebral artery sign; HSE, hemispherical sulcus effacement; ICA, internal carotid artery; LIR, loss of insular ribbon; M1, sphenoidal portion of the middle cerebral artery. | ||||||
| LIR, ALN, or HSE | 65 | 62% | 18 (62%) | 25 (74%) | 22 (58%) | 0 |
| LIR | 39 | 37% | 16 (55%) | 16 (47%) | 7 (18%) | 0 |
| ALN | 43 | 41% | 15 (52%) | 22 (65%) | 6 (16%) | 0 |
| HSE | 43 | 41% | 12 (41%) | 13 (38%) | 18 (47%) | 0 |
| LIR + ALN + HSE | 20 | 19% | 10 (34%) | 8 (24%) | 2 (5%) | 0 |
| LIR + ALN | 14 | 13% | 3 (10%) | 8 (24%) | 3 (8%) | 0 |
| LIR + HSE | 3 | 3% | 2 (7%) | 0 | 1 (3%) | 0 |
| ALN + HSE | 3 | 3% | 0 | 2 (6%) | 1 (3%) | 0 |
| Isolated LIR | 2 | 2% | 1 (3%) | 0 | 1 (3%) | 0 |
| Isolated ALN | 6 | 6% | 2 (7%) | 4 (12%) | 0 (%) | 0 |
| Isolated HSE | 17 | 16% | 0 | 3 (9%) | 14 (37%) | 0 |
| HMCAS | 27 | 26% | 10 (34%) | 11 (32%) | 6 (16%) | 0 |
| No sign | 36 | 34% | 10 (34%) | 8 (24%) | 14 (37%) | 4 (100%) |