[Intraepidermal Merkel cell carcinoma with INSM1 expression. A case report].

We report the case of a 90-year-old male who presented with an erythematous desquamative plaque on his left cheek. Histopathology demonstrated an epidermal lesion with multifocal epithelial growth. The cells were small, with scant cytoplasm and hyperchromatic nuclei with molding and a high mitotic and apopototic rate.