Trichoblastoma (TB) is an infrequent, generally benign neoplasm arising from the germinative hair bulb with induction of mesenchymal stroma and with no adverse outcomes such as relapses, metastasis, or death. We report 2 cases of false-negative tumor-free margins after Mohs micrographic surgery (MMS) for aggressive TB.
*Dermatology Department, Sagrado Corazon Hospital, University of Barcelona, Barcelona, Spain
†Pablo Umbert Institute, Corachan Clinic, Barcelona, Spain.
The authors have no funding or conflicts of interest to disclose.
Reprints: Pablo Umbert Millet, MD, Dermatology Department, Sagrado Corazon Hospital, University of Barcelona, Paris, 83-85, 08029 Barcelona, Spain (e-mail: email@example.com).