Type B2 thymoma

WHO type B2 thymoma. The ratio of epithelial tumor cells to lymphocytes is almost 50:50. Epithelial tumor cells are forming clusters of 3 and more cells. Magnification, H&E x 400.

WHO: World Health Organization; H&E: hematoxylin and eosin.

Courtesy of Anja C Roden, MD.

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