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Histopathological findings in the case (A) in high power field, tumor cells contain cuboidal to low-columnar cells, including hyperchromasia, pleomorphism, and prominent nucleoli (H&E, ×200). B, The tumor cells express TTF-1, indicating that they are metastasized from lung (TTF-1, ×200). C, The tumor cells express CK-7(CK-7, ×200). D, The tumor cells express NaspinA (NaspinA, ×200). CK-7 = cytokeratin-7, TTF-1 = transcription termination factor, RNA polymerase I.
