Type B3 Thymoma : Definition
Comments:
Due to predominance of neoplastic epithelial cells and paucity of lymphocytes, type B3 thymoma has a pink appearance at low magnification, unlike type B1 or type B2 thymomas which appear basophilic. The tumor cells are arranged in clusters or solid sheets separated into lobules by coarse or delicate fibrous bands. Areas of hemorrhage, necrosis, and cystic change are commonly seen.