title: A case of tumor of the follicular infundibulum with sebaceous differentiation.
abstract: Tumor of the follicular infundibulum (TFI) is an uncommon benign adnexal tumor that usually presents as a solitary keratotic papule on the face or scalp of elderly patients. Histopathologically, it typically manifests as a plate-like fenestrated proliferation of monomorphic pale-staining cells. A 76-year-old male presented with about a 2 cm, well-defined, yellowish to brownish, slightly elevated, twisted and bent, interrupted, cord-like plaque on his left lower abdomen. Microscopic examination revealed a sharply demarcated plate-like proliferation of pale cells localized in the papillary dermis with multiple connections to the overlying epidermis. The histopathological features were compatible with TFI, except for foci of sebaceous differentiation. There has been one previous case report of TFI with sebaceous differentiation in the English medical literature. Herein, we report on a singular case of TFI with sebaceous differentiation.
authors: Department of Dermatology and the Research Institute of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
authors: Deok-Woo
authors: DW
authors: Lee
authors: Ji-Hye
authors: JH
authors: Yang
authors: Hyung-Min
authors: HM
authors: Lee
authors: Chong-Hyun
authors: CH
authors: Won
authors: Sungeun
authors: S
authors: Chang
authors: Mi-Woo
authors: MW
authors: Lee
authors: Jee-Ho
authors: JH
authors: Choi
authors: Kee-Chan
authors: KC
authors: Moon