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Figure 3: Microphotographs showing features of definite vasculitis- necrotizing vasculitis. (a) Nutrient vessels shows band of fibrinoid necrosis lining the lumen (arrow); (b) Fibrinoid necrosis appearing orange in the Masson trichrome (MAT) stain (arrow); (c) Transmural infiltration of vessels wall by inflammatory cells is highlighted by immunostaining for leukocyte marker (LCA); (d) Wallerian degeneration and myelin degeneration form ovoids of myelin due to acute ischemia; (e and f) Myelin stains (Kulchitsky Pal, K-Pal) show non-uniform myelin loss in sectors and also in higher magnification

Figure 3: Microphotographs showing features of definite vasculitis- necrotizing vasculitis. (a) Nutrient vessels shows band of fibrinoid necrosis lining the lumen (arrow); (b) Fibrinoid necrosis appearing orange in the Masson trichrome (MAT) stain (arrow); (c) Transmural infiltration of vessels wall by inflammatory cells is highlighted by immunostaining for leukocyte marker (LCA); (d) Wallerian degeneration and myelin degeneration form ovoids of myelin due to acute ischemia; (e and f) Myelin stains (Kulchitsky Pal, K-Pal) show non-uniform myelin loss in sectors and also in higher magnification