Reflectance Confocal Microscopy Identification of Subclinical Basal Cell Carcinoma after Vismodegib Treatment: Report of a Case.

Although surgery represents the treatment of choice for the majority of basal cell carcinomas, different therapies are required to treat the advanced ones. Vismodegib and sonidegib are the two oral Smoothened (Smo) inhibitors approved for the treatment of advanced basal cell carcinoma. Clinical detection of subclinical basal cell carcinoma during and after vismodegib treatment could be difficult, requiring the use of dermoscopy and reflectance confocal microscopy as noninvasive diagnostic methods. We report the case of a 62-year-old woman with a locally advanced basal cell carcinoma successfully treated with vismodegib in which dermoscopy and reflectance confocal microscopy showed their superiority in detecting subclinical recurrent basal cell carcinoma developed on scar tissue after complete regression of the tumor.