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Figure 4: Microphotographs showing features of definitive vasculitis in nerve, muscle and skin. (a) Vasculitis involving medium and small vessels and venules sparing the nutrient vessels; (b) Peri-vascular inflammation around endoneural vessels; (c and d) Microvasculitis –perivascular inflammation around small vessels and endoneural capillaries is highlighted by immunostaining for leukocyte common antigen (LCA); (e) Muscle biopsy showing vasculitis; (f) Skin biopsy showing vasculitis

Figure 4: Microphotographs showing features of definitive vasculitis in nerve, muscle and skin. (a) Vasculitis involving medium and small vessels and venules sparing the nutrient vessels; (b) Peri-vascular inflammation around endoneural vessels; (c and d) Microvasculitis –perivascular inflammation around small vessels and endoneural capillaries is highlighted by immunostaining for leukocyte common antigen (LCA); (e) Muscle biopsy showing vasculitis; (f) Skin biopsy showing vasculitis