PDPN and neoplasm: Immunostaining of the tumor tissue revealed positive results for cytokeratin (CK) AE1/AE3, CK5/6, Wilm’s tumor-1, and calretinin; weak D2-40 and Alcian blue stain positivity; local positivity for cluster of differentiation (CD) 31; and negative results for CD34, Factor VIII, and hyaluronidase alcian blue stain (Fig. 5).