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H&E staining (a, ×100) and immunohistochemical examination (b–e, ×100) of the anterior mediastinal tumor demonstrated positive results for CK7 (b clone OV-TL 12/30, DAKO), CK20 (c clone Ks20.8, DAKO), CDX2 (d clone DAK-CDX2, DAKO) and CD5 (e clone 4C7, Novocastra)
