case_images: PMC6477498_01
case_images: Well-defined lesion on the right buttock.
case_images: cde-0011-0048-g01.jpg
case_images: PMC6477498_01_cde-0011-0048-g01.jpg
case_images: F1
case_images: On examination, there was a 0.8 x 0.7-cm well-defined, brown nodule on the right buttock (Fig. 1).
case_images: Nests of basaloid cells with peripheral palisading and surrounding cleft were attached to seborrheic keratosis. H&E staining. x40.
case_images: cde-0011-0048-g02.jpg
case_images: PMC6477498_01_cde-0011-0048-g02.jpg
case_images: F2
case_images: Nests of basaloid cells with peripheral palisading and surrounding cleft were attached to the lesion of seborrheic keratosis (Fig. 2).
case_images: Basal cell carcinoma was selectively positively stained with Ber-EP4. Immunostaining. x40.
case_images: cde-0011-0048-g03.jpg
case_images: PMC6477498_01_cde-0011-0048-g03.jpg
case_images: F3
case_images: In an immunochemical study, strong positive staining for Ber-EP4, a useful marker of basal cell carcinoma, was found in the basal cell carcinoma area, but not in the seborrheic keratosis area (Fig. 3).