抄録
We report a case of trichilemmal carcinoma with infiltration of the facial nerve in a 77-year-old man. Since the tumor was accompanied by invasion of the facial nerve, a parotidectomy with tumor resection was performed. Histological examination showed frequent trichilemmal keratinization in the central portion of the nests and revealed perineural invasion. Based on these findings, we suspected a malignant proliferating trichilemmal cyst (MPTC), rather than a malignant trichilemmoma (MT). We discuss briefly the histopathological differences between MPTC and MT.
