Trephine biopsy sections. (A) A patient with follicular centroblastic centrocytic lymphoma stained with hematoxylin and eosin showing low-volume, nodular disease (original magnification ×100). (B) A patient with T-lymphoblastic lymphoma stained with anti-CD3; cells with dark cytoplasm are CD3⁺ (original magnification ×400). These photomicrographs show the low level of lymphoma infiltration which in both cases was detected by PET.