Cytologically, the tumor cells appear similar to the synovial lining cells and maintain the characteristics of both A-cells and B-cells and appear to have secretory function.
其细胞形态与滑膜被复细胞相似且兼有A、B型细胞的特点，并有类分泌现象。
Histopathologic features of RA encompass infiltration by macrophages and T cells synovial lining hyperplasia, neoangiogenesis, pannus formation and destruction of cartilage and bone.
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。
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