滑膜增厚，形成许多绒毛样突起，即血管翳，血管翳具有破坏性，可侵蚀关节软骨，最终破坏关节。
This "pannus" is destructive and produces erosion of the articular cartilage, eventually destroying the joint.
其主要病理特点是滑膜细胞增生、衬里层增厚、多种炎性细胞浸润、血管翳形成，以及软骨和骨组织的破坏。
Histopathologic features of RA encompass infiltration by macrophages and T cells synovial lining hyperplasia, neoangiogenesis, pannus formation and destruction of cartilage and bone.
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