Peripheral palisading of the basal cells is present. Peripheral palisading of basaloid cells frequently is observed. A dense band or brushlike network of elastic fibers frequently is demonstrated at the border of the tumor, again analogous to the normal hair follicle. This can be observed readily by Verhoeff van Gieson or orcein stains. For multiple and eruptive tumors, treatment generally is unrewarding, as attempts with corticosteroids, keratolytics, cryotherapy, and topical and systemic retinoids result in only partial improvement.
Prognosis is excellent.
Rare cases have been associated with nevus sebaceous and Cowden syndrome. Tumor of the follicular infundibulum shows a plate-like dermal tumor with anastomosing islands and cords with connections to the overlying epidermis and horn cysts. Tumor of the follicular infundibulum shows epidermal connections, horn cysts and anastomosing islands. Tumor of the follicular infundibulum shows epidermal connections, peripheral palisading and horn cyst. A distinctive presentation of the tumor of follicular infundibulum.