Lymph node biopsies of patients no. 1 (A and B), no. 3 (C), and no. 4 (D). (A) Diffuse infiltration of tumor cells is noted in a T-zone area with sparing of follicles (original magnification × 100). (B and C) The component cells show blastic morphology with round to moderately irregular nuclei, small to intermediate-sized nucleoli, and scant cytoplasm (original magnification × 600). (D) The tumor cells show irregular nuclei with inconspicuous nucleoli.