Histopathology showed the tumor located in epidermis, composed most of basel like cells and some atypically eosinophilic squamous like cells scattered as masses.

• 皮损组织病理检查显示:肿瘤位于表皮内,由大多数基底样细胞和少数呈团块状分布的不典型嗜伊红鳞状细胞组成,部分区域可见管腔样结构。