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(A) Mediastinal needle biopsy indicated type WHO type B3 thymoma (hematoxylin and eosin; original magnification, ×50), with negative staing of CD117, but positive sating of KI67 and CK19 (immunohitochemistry; original magnification, ×50). (B) PD-L1 was strongly expressed by 80% of all neoplastic thymic epithelial cells (immunohitochemistry; original magnification, ×50).
