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Idiopathic MCD, plasma cell type. (A) A small follicle with attenuated mantle cuff is surrounded by numerous mature plasma cells. (B) Plasma cells have mature nuclear features, with some cells containing Russell-body inclusions. (C) A stain for CD20 is positive in follicles but negative in plasma cells. Some increase in vascularity within the follicles is evident. (D) Abundant plasma cells are positive for CD138. Plasma cells were polytypic for kappa and lambda (not shown).
