Bone marrow finding of PCs rimming around a lymphocyte aggregate. (A) The lymphocytic aggregates show a germinal center (H&E stain, ×400). PCs form a rim around the lymphocytic collection detected by immunohistochemistry of (B) CD138, (C) κ, and (D) λ.
Abbreviations: H&E, hematoxylin and eosin; PC, plasma cell.
© Ann Lab Med