TABLE 1.
Distribution of internal carotid artery morphological variations, distance from carotid bifurcation and association with internal carotid artery stenosis
| Internal carotid artery morphological variations
|
||||
|---|---|---|---|---|
| Tortuosity, n (%) | Kinking, n (%) | Coiling, n (%) | Total, n | |
| Location relative to carotid bifurcation* | ||||
| Proximal | 139 (71.3) | 138 (58.5) | 6 (100) | 283 |
| Distal | 56 (28.7) | 98 (41.5) | – | 154 |
| Total | 195 (44.6) | 236 (54.0) | 6 (1.4) | 437 |
| Internal carotid artery stenosis | ||||
| Absent | 152 (77.9) | 185 (78.4) | 4 (66.7) | 341 |
| <50% | 35 (17.9) | 44 (18.6) | – | 79 |
| ≥50% | 8 (4.2) | 7 (3.0) | 2 (33.3) | 17 |
| Total | 195 (100) | 236 (100) | 6 (100) | 437 |
*
Internal carotid artery morphological variations were classified as proximal when they were located up to 4 cm from the carotid bifurcation, and distal when located more than 4 cm from the bifurcation