Classic primary cutaneous marginal zone lymphoma

(A) A superficial and deep, perivascular and periadnexal, dermal lymphoplasmacytic infiltrate is present with scattered follicles sometimes with CD10–, BCL6+ germinal centers and IgM+, IgD+ (not shown) mantle zones and a more polymorphous-appearing interfollicular proliferation.
(B) The more polymorphous-appearing interfollicular proliferation includes plasma cells at the periphery.
(C) Immunohistochemical stains demonstrated CD20+ B cells concentrated in the follicles.
(D) Immunohistochemical stains demonstrated numerous CD3+ T cells, clearly predominating in the interfollicular regions.