A case of epidermoid cyst in the mandible

A case of epidermoid cyst in the mandible is reported in which the cystic lining epithelium was evaluated immunohistochemically with anti-keratin antibody. The patient was a 64-year-old man who was referred to our department due to swelling of the lower labial gingiva in the median region. The swollen lesion was clinically diagnosed as a cyst of the lower jaw, and it was surgically enucleated under general anesthesia. The cyst contained serous fluid with like-scum substances, and a high level of CEA was found. The cystic epithelium was examined immunohistochemically with anti-cytokeratin antibody. Staining of PKK2 and CK10 was positive in basal cells and parakeratinizing cells, while that of CK5 and CK19 was negative.