Figure 1: Case 1, Small vessels in the subcutis of thigh skin feature atypical hyperchromatic lymphoid cells in the lumen (Panel A, hematoxylin and eosin stain, original magnification ×400) which are CD20 positive (Panel B, original magnification ×400); Case 2, Liver sinusoids filled and expanded by large atypical B-cells (Panel C, hematoxylin and eosin stain, original magnification ×400); Case 3, Small vessels in the thyroid are filled with large pleomorphic B-cells (Panel D, hematoxylin and eosin stain, original magnification ×400) which are CD20 positive (Panel E, original magnification ×200); Case 4, CD20 stain in the bone marrow biopsy highlighting occasional atypical B-cells in the vessels (Panel F original magnification ×400)