A Low-Grade Trichoblastic Carcinoma Treated with Mohs Micrographic Surgery.

Authors :: Leeman A
de Cuba EMV
Jaspars LH
Quint KD
Genders RE
Source :: Case reports in dermatology [Case Rep Dermatol] 2021 Feb 18; Vol. 13 (1), pp. 129-133. Date of Electronic Publication: 2021 Feb 18 (Print Publication: 2021).
Publication Year :: 2021
Abstract: Trichoblastomas are rare dermal neoplasms usually found on the scalp and face. Histology shows a proliferation of small basaloid cells arranged in cords or fields surrounded by cellular stroma. Trichoblastomas are usually not aggressive, but trichoblastic carcinomas arising from preexisting trichoblastomas have been described and have been linked to basal cell carcinoma. We found a tumor with features of trichoblastoma with presence of Merkel cells, but with a deeply infiltrative growth pattern into the fat and muscle tissue, without significant architectural or cellular atypia. Tumors with similar growth patterns were previously described as deeply invasive trichoblastic neoplasms. It appears to be a new entity that has been described before but has not been fully characterized: low-grade trichoblastic carcinoma. This malignancy seems to show only locally aggressive growth. Radical excision was accomplished with Mohs micrographic surgery.<br />Competing Interests: The authors report no conflict of interest.<br /> (Copyright © 2021 by S. Karger AG, Basel.)