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High CAS risk anatomic features associated with age ≥ 80 years
| Access-related |
| Aortic arch/supra-aortic vessel calcification |
| Aortic arch elongation (type II/III arch) |
| Tandem lesion in CCA or innominate |
| ICA-CCA tortuosity |
| Lesion-related |
| Severe stenosis > 85% |
| Heavily calcified stenosis |
| Ulcerated lesion |
