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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]

From: Are classification criteria for vasculitis useful in clinical practice? Observations and lessons from Colombia

Vasculitis diagnosis Number N = 304 Frequencies per 100,000 histological specimens Percentages
    groups of vasculitis subgroups of vasculitis
I. Primary vasculitis 104 62.8 34.2  
   A. Large vessel vasculitis 1 0.6   1
1. Giant cell (Temporal) arteritis 1 0.6   
   B. Medium sized vessel vasculitis 24 14.5   23.1
1. Polyarteritis nodosa 24 14.5   
   C. Small vessel vasculitis 79 47.7   75.9
1. Wegener's granulomatosis 3 1.8   
2. Churg-Strauss syndrome 2 1.2   
3. Microscopic polyangiitis 1 0.6   
4. Henoch-Schönlein purpura 9 5.4   
5. Cutaneous leukocytoclastic vasculitis 64 38.7   
II. Not classified vasculitis 200 120.8 65.8  
Total 304 183.6 100