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(A) Grade 4+ diffusely distributed lymphocytes (more than 100 cells per high-power field) in a membrane around a failed, nonMOM hip arthroplasty are shown (Original magnification: ×100). (B) This is another example of marked chronic inflammation including lymphocytes and plasma cells, with diffuse and perivascular distribution in a case of nonMOM arthroplasty thought to have developed aseptic loosening (Original magnification: ×400).
