Multiply recurrent trichilemmal carcinoma with perineural invasion and cytokeratin 17 positivity.


Journal Article

BACKGROUND:Trichilemmal carcinoma is an uncommon cutaneous malignancy that is thought to be the malignant counterpart of the trichilemmoma. Despite histologic features such as pronounced cytologic atypia, trichilemmal carcinoma is often described as having a rather benign clinical course. Cases of tumor recurrence after therapy are uncommon, and tumor neurotropism has never been described. OBJECTIVE:A case of multiply recurrent trichilemmal carcinoma with perineural invasion is described. The outer root sheath differentiation of this neoplasm is confirmed with the use of novel antibodies directed toward cytokeratins that are expressed in this area of the hair follicle. METHODS:The trichilemmal carcinoma was excised using the Mohs surgical technique. Tissue obtained during the extirpation of the tumor was subjected to immunohistochemical staining for cytokeratin 15, cytokeratin 17, and c-erb-B2. RESULTS:Tumor neurotropism was noted. The trichilemmal carcinoma demonstrated abundant cytoplasmic staining for cytokeratin 17 and c-erb-B2. CONCLUSIONS:In distinction to previous reports, this case reveals that trichilemmal carcinoma can demonstrate significant biological aggression, as reflected by tumor neurotropism and by failure to respond to multiple surgical excisions. The purported outer root sheath differentiation of this neoplasm is confirmed with the use of novel immunohistochemical staining. This immunohistochemical staining may be useful in differentiating trichilemmal carcinoma from other clear cell neoplasms.

Full Text

Duke Authors

Cited Authors

  • Allee, JE; Cotsarelis, G; Solky, B; Cook, JL

Published Date

  • August 2003

Published In

Volume / Issue

  • 29 / 8

Start / End Page

  • 886 - 889

PubMed ID

  • 12859397

Pubmed Central ID

  • 12859397

Electronic International Standard Serial Number (EISSN)

  • 1524-4725

International Standard Serial Number (ISSN)

  • 1076-0512

Digital Object Identifier (DOI)

  • 10.1046/j.1524-4725.2003.29241.x


  • eng