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Type B2 Thymoma : Microscopic

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At low power, type B2 thymoma has lobular architecture with delicate or thick collagenous bands dividing it into irregularly shaped lobules. The tumor appears basophilic due to abundance of lymphocytes which are predominantly immature T-cells. Within this rich lymphocytic infiltrate, there are polygonal epithelial cells scattered singly or in small clusters. The epithelial cell density is higher than that seen in type B1 thymoma or the normal thymus.

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