Infundibular and trichilemmal keratinization of a pilar tumor.
Microscopic examination of a cystic epithelial tumor removed from the elbow of a 52-year-old man showed islands of epithelium undergoing keratinization without formation of a visible granular cell layer, as occurs within the follicular isthmus, in trichilemmal cysts, and in pilar tumors (proliferating trichilemmal cysts). Other areas showed keratinization with the formation of a distinct, even prominent, granular cell layer, as seen within the follicular infundibulum and in epidermal cysts. Possible modes of origin and relationships among these tumors and epidermal cysts are presented.
J W
JW
Patterson
D004814:Epidermal Cyst / Q000378:metabolism* / Q000473:pathology; D006197:Hair / Q000378:metabolism*; D006801:Humans; D007633:Keratins / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D012871:Skin Diseases / Q000378:metabolism* / Q000473:pathology
D007633:Keratins