Histologic examination of the patient's spleen. (A-B) Hematoxylin and eosin staining. Original magnifications ×25 (A) and ×400 (B). The red pulp is highly congestive and the white pulp is atrophic, with a marked reduction of the periarteriolar lymphoid sheaths (arrows in panel A). The splenic cords are packed with agglutinated RBCs (arrow in panel B). (C-D) Perls iron staining. Original magnification ×100 (C) and ×400 (D). Very few hemosiderin-containing macrophages are observed (arrows).