Seborrheic keratosis. A, Seborrheic keratosis has a nodular, “stuck-on” gross appearance. B, Microscopically, the tumor is composed of basaloid cells associated with hyperkeratosis and keratin-filled cysts. Hematoxylin and eosin, 40×. Source: Chapter 20. Dermatopathology, Pathology: The Big Picture Citation: Kemp WL, Burns DK, Brown TG. Pathology: The Big Picture; 2008 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/kemp1/kemp1_c020f003b.png&sec=41573210&BookID=499&ChapterSecID=41568303&imagename= Accessed: January 02, 2018 Copyright © 2018 McGraw-Hill Education. All rights reserved