FIGURE 2. Representative aspects of the histological features observed in the initial biopsy. A Low-power view of the tissue section presenting epithelial proliferation and apparent invasion of the lamina propria in one of the fragment borders (arrow). [Hematoxylin-eosin stain, scale-bar = 1mm] B Detail of epithelial projections observed in the specimen presenting acanthosis (white bar), abrupt keratin pearl formation (black arrow), mild cellular pleomorphism in the basal layer (black star), occasional mitosis (white arrow), and moderate infiltrate by inflammatory cells (white star). [Hematoxylin-eosin stain, scale-bar = 125 μm].
