(A) Cysts lined by stratified squamous epithelium (B), which is intensely positive for high-molecular-weight cytokeratins (CKs; C). Numerous duct-like formations (D), lined by a double layer of cells (E). Intense expression of CK7 in luminal cells of the duct-like structures (F). Hematoxylin and eosin stain (A,B,D,E). Immunoperoxidase stain (C, F). Pleomorphic adenoma with extensive squamous metaplasia and keratin cyst formations in minor salivary gland: a case report: Goulart MC, Freitas-Faria P, Goulart GR, Oliveira AM, Carlos-Bregni R, Soares CT, Lara VS - Journal of applied oral science: revista FOB (2011). Not altered. CC.