VASCULITIS
Small vessel
Venule
Lymphocytes and histiocytes
| In the center
of palisades: Mucin |
Granuloma annulare |
| Degenerated collagen | Necrobiosis lipoidica, early |
| Crowded thickened bundles of collagen | Necrobiosis lipoidica, late |
| Extensive degeneration of collage, necrosis of inflammatory cell | Necrobiotic xanthogranuloma |
| Fibrin | Rheumatoid nodule |