(A) Hematoxylin and eosin (original magnification x20), view showing lobular proliferation of atypical keratinocytes with areas of peripheral palisading of basaloid cells. The spinous layer shows broad areas of pale staining cells with areas of abrupt keratinization.
(B) Hematoxylin and eosin (original magnification x40), view showing enlarged keratinocytes with pleomorphic nuclei, and abundant mitotic activity, including atypical mitoses.
From: Hamman MS, Brian Jiang SI. Management of trichilemmal carcinoma: an update and comprehensive review of the literature. Dermatol Surg 2014; 40:711. DOI:
10.1111/dsu.0000000000000002. Reproduced with permission from Lippincott Williams & Wilkins. Copyright © 2014 American Society for Dermatologic Surgery. Unauthorized reproduction of this material is prohibited.
