Figures legend:
Figure 1. Hematoxylin and eosin (H&E) staining, depicting dense dermal infiltration of monomorphous medium-sized mononuclear cells. The epidermis remained intact. (×200)
Figure 2. H&E staining, infiltration of monomorphous medium-sized mononuclear cells, with fine chromatin, scant cytoplasm, and small nucleoli. Mitotic figures were frequent (×400)
Figure 3. IHC study:CD45 (A), CD79a (B), CD99 (C), markers are positive in tumor cells.(x200)
Figure 4. IHC study: TdT marker is strongly positive in tumor cells. (x400)
Figure 5. IHC study: Ki67 expression in approximately 40% of tumor cells (x400)