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Amyloid Deposition in Leptomeningeal Vessels: Thioflavin S Stain
| Nature of vessels | Number counted | Proportion of vessels positive for amyloid |
|---|---|---|
| Total arteries | 681 | 20.3% |
| Total veins | 352 | 4.4% |
| Arteries <60 μm in diameter | 458 | 24.7% |
| Arteries >60 μm in diameter | 223 | 11.2% |
| Veins <60 μm in diameter | 193 | 4.5% |
| Veins >60 μm in diameter | 159 | 4.2% |
