Immunohistochemistry was positive for cytokeratin 7 and negative for thyroid transcription factor 1 (TTF-1), caudal type homeobox transcription factor 2 (CDX2), cytokeratin 20, protein S100, thyroglobulin, the anti-melanosome clone, human melanoma black 45 (HMB-45), and the anti-melanoma, melanoma antigen recognized by T cells 1 (MART-1). Here, CDX2 is linked to melanoma.