Fig. 1

The epithelioid cells (red arrow) were uniform and approximately the same size as the parabasal cells, which with abundant clear cytoplasm (A&B Papanicolaou stain, × 400), showing predominantly round or oval nuclei with finely stippled chromatin. Distinct round nucleoli were visible (C Papanicolaou stain, × 400), numerous melanin pigments were identified in the cytoplasm (D Papanicolaou stain, × 400)