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A A specimen obtained by computed tomography (CT)-guided needle biopsy in the anterior mediastinal mass. Pathologically, spindle cells are proliferating with sparsely dispersed lymphocytes (hematoxylin and eosin staining). Immunohistochemical analysis of the tumor. B Positive reaction for CK AE1/AE3 in spindle cells; C Positive reaction for CK5/6 in spindle-shaped cells; D CD3 positive lymphocytes infiltrating the tumor
