case_images: PMC3354388_01
case_images: Benign epidermal inclusion cyst filled with laminated keratin (hematoxylin and eosin, original magnification x100).
case_images: NAJMS-2-46-g001.jpg
case_images: PMC3354388_01_NAJMS-2-46-g001.jpg
case_images: F1
case_images: Histological examination of the specimen showed a cystic lesion lined by bland squamous epithelium and filled with laminated keratin (Fig. 1).
case_images: Malignant squamous cell carcinoma arising from the epidermal cyst; with mitotic activity and cellular atypia (hematoxylin and eosin, original magnification x400).
case_images: NAJMS-2-46-g002.jpg
case_images: PMC3354388_01_NAJMS-2-46-g002.jpg
case_images: F2
case_images: These areas of typical epidermal cyst were juxtaposed with zones that displayed marked nuclear irregularity with mitotic activity and an infiltrative growth pattern (Fig. 2).
case_images: Immunohistochemistry showing positivity of the tumor cells for P53 protein (original magnification x200).
case_images: NAJMS-2-46-g003.jpg
case_images: PMC3354388_01_NAJMS-2-46-g003.jpg
case_images: F3
case_images: Immunohistochemical detection of p53 antigen was found only in cell squamous carcinoma (Fig. 3).