CDX2 and adenocarcinoma: Results: The second premolar was extracted, and an incisional biopsy of the osteolytic lesion was performed for histological and immunohistochemical examination, which revealed an adenocarcinoma fragment with mucinous characteristics and a morphology and immunophenotype compatible with caudal-related homeobox transcription factor 2 (CDX2) and cytokeratin (CK) 20.