fig1

Figure 1. Photomicrograph depicting histopathological features of a purpuric lesion in a case of microscopic polyangiitis. (A) Leukocytoclastic vasculitis involving small vessels in the subcutaneous fat (H&E, original magnification 40×). (B) A higher magnification image showing details of leukocytoclastic vasculitis: fibrinoid necrosis of the vessel wall, neutrophils surrounding and infiltrating the vessel, extravasated erythrocytes, and nuclear dust (H&E, original magnification 100×).