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Allergic (leukocytoclastic) vasculitis Septic vasculitis 1. Leukocytoclasis, i.e., nuclear “dust” of neutrophils invariable and abundant usually 1. No nuclear “dust” of neutrophils 2. Fibrin in and around the wall of venules 2. No fibrin in and around the wall of small vessels 3. No thrombi 3. Thrombi in small vessels 4. Eosinophils present commonly 4. […]