Fig. 1 Rectal mucosa of a 21-year-old patient with a 4-month history of rectal bleeding. Lymphatic follicle with a prominent germinal center containing tingible body macrophages (H&E, × 10). ▶ Fig. 2 Rectal mucosa of the same patient. a Lymphatic follicle positive for CD20 (× 10); b lymphatic follicle with germinal center negative for Bcl2 (× 10).