title: A case of an undifferentiated squamous cell carcinoma arising from an epidermal cyst.
abstract: An epidermal cyst is a common benign subcutaneous tumor and rarely develops malignancy. We report a case of an undifferentiated cutaneous squamous cell carcinoma (SCC) that arose from an epidermal cyst on the left side of the neck. The epidermal cyst had rapidly increased in size and presented cauliflower-like tumor. Histological study revealed undifferentiated squamous cell carcinoma that was arising from the epidermal cyst.
authors.affiliation: Department of Dermatology, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawara-cho, Sakyo, Kyoto 606-8507, Japan.
authors.forename: Mai
authors.initials: M
authors.lastname: Tokunaga
authors.forename: Masami
authors.initials: M
authors.lastname: Toya
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Endo
authors.forename: Akihiro
authors.initials: A
authors.lastname: Fujisawa
authors.forename: Miki
authors.initials: M
authors.lastname: Tanioka
authors.forename: Mayumi
authors.initials: M
authors.lastname: Kato
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Miyachi