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Distribution of intracranial and extracranial artery stenosis in different age groups.
| No arterial stenosis | Intracranial stenosis | Extracranial stenosis | Intracranial combined extracranial | |
|---|---|---|---|---|
| Youth group | 12 | 16 | 3 | 8 |
| Middle age group | 123 | 178 | 16 | 58 |
| Elderly group | 56 | 70 | 10 | 50 |
