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)