Figure 3. Photomicrography of the bone marrow. A - Massive marrow infiltration by lymphoma cells (H&E, 100X); B - Lymphoma cells, composed of large atypical cells with blue cytoplasm; round, irregular and vesicular nuclei with prominent nucleoli; and abundant cytoplasm. Some cells present homogeneous eosinophilic cytoplasm (H&E, 400X); C - Positivity for CD 20 in the lymphomatous cells (200X); D - Positivity for BCL-2 in the lymphomatous cells (400X).