Pigmented trichoblastoma developed in a sebaceous nevus: HRAS mutation as a common molecular driver

Publication date: Available online 30 March 2017
Source:Pathology - Research and Practice
Author(s): Deborah Saraggi, Roberto Salmaso, Elisa Valentini, Giada Munari, Vincenzo Vindigni, Massimo Rugge, Matteo Fassan, Lorenzo Cerroni
A 40-year-old woman presented with a pigmented nodule on a previously existing yellowish, verrucous plaque on the scalp. The histological diagnosis was consistent with a pigmented trichoblastoma developed within a sebaceous nevus (SN). A multigene hotspot mutational profiling of the BRAF, NRAS, HRAS and KRAS genes was carried out, and a shared G13R HRAS mutation in both the trichoblastoma and the sebaceous nevus components was found. These data support a common molecular landscape of the two lesions.



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