Pilar tumor of scalp (proliferating trichilemmal cyst): Low power magnification displays an intradermal scalp cystic mass (Click here to Erase Mark outlining cystic mass) lined by proliferating trichilemmal epithelium with spillage of hyalinized keratinous material. Adjacent to the cyst lies a root of hair follicle. (Click here to Erase Mark outlining hair follicle)