图示：脉管炎损伤性病变在于急性炎症和凝血机制的共同作用。动脉壁逐渐坏死，血管腔内有血栓形成。
The vasculitis shown here demonstrates the destruction that can accompany the acute inflammatory process and the interplay with the coagulation mechanism. The arterial wall is undergoing necrosis, and there is thrombus formation in the lumen.