(A through C) Parotid gland MALT lymphoma. Low magnification (A) shows diffuse infiltrate with numerous lymphoepithelial lesions. High magnification (B) shows centrocyte-like cells invading ductal epithelium. The lymphoma is CD10⁻(C) in contrast to residual reactive follicle centers. (D through F) Cervical lymph node. Low magnification (D) shows effacement of lymph node architecture by a diffuse infiltrate of centrocyte-like cells seen at high magnification (E). The tumor cells are CD10⁻ (F), but small clusters of CD10⁺ residual follicle center cells are present. (G through I) Inguinal lymph node showing the features of follicular lymphoma at low magnification (G) and high magnification (H). The tumor is CD10⁺ (I). (J through L) Spleen showing involvement by follicular lymphoma at low magnification (J), high magnification (K), and CD10 expression (L).