Table 1 Classification of histological specimens with vasculitis from the San Juan de Dios Hospital, Bogotá, Colombia, 1953 – 1997, according to the Chapel Hill system [28]
Vasculitis diagnosis | Number N = 304 | Frequencies per 100,000 histological specimens | Percentages | |
|---|---|---|---|---|
| Â | Â | Â | groups of vasculitis | subgroups of vasculitis |
I. Primary vasculitis | 104 | 62.8 | 34.2 | Â |
   A. Large vessel vasculitis | 1 | 0.6 |  | 1 |
1. Giant cell (Temporal) arteritis | 1 | 0.6 | Â | Â |
   B. Medium sized vessel vasculitis | 24 | 14.5 |  | 23.1 |
1. Polyarteritis nodosa | 24 | 14.5 | Â | Â |
   C. Small vessel vasculitis | 79 | 47.7 |  | 75.9 |
1. Wegener's granulomatosis | 3 | 1.8 | Â | Â |
2. Churg-Strauss syndrome | 2 | 1.2 | Â | Â |
3. Microscopic polyangiitis | 1 | 0.6 | Â | Â |
4. Henoch-Schönlein purpura | 9 | 5.4 |  |  |
5. Cutaneous leukocytoclastic vasculitis | 64 | 38.7 | Â | Â |
II. Not classified vasculitis | 200 | 120.8 | 65.8 | Â |
Total | 304 | 183.6 | 100 | Â |