Abstract
We report a 29-year-old man with verrucous-keratotic malignant melanoma on the left thigh. The black to dark brown warty plaque, which was clinically compatible with seborrheic keratosis, was observed. Dermoscopic findings showed that the surface of the lesion was covered with a gray-blue area, whitish veil, and black dots/globules. Furthermore, milky-red globules were also recognized. However, pigment network and radial streamings were in conspicuous.
Histopatholigical examination of the nodule was conducted. Hyperkeratosis, acanthosis, and nests, which were composed of round or spindle melanoma cells were observed in the epidermis. Pagetoid cells in the epdermis were also recognized in the surrounding pigment macules. This tumor was diagnosed as verrucous-keratotic malignant melanoma from the above findings. [Skin Cancer (Japan) 2002; 17: 16-20]
