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(a) Perivascular infiltrate highlighting the lymphoplasmacytic appearance of the cells, hematoxylin and eosin stain, original magnification 600x. (b) Immunohistochemical stain for CD20 highlights a perivascular infiltrate of B-cells, original magnification 200x. (c) and (d) Positive staining of the tumor cells for lambda light chains but not for kappa light chains signifies lambda light chain restriction, in situ hybridization, original magnification 200X.
