5McGuigan K, Shurman D, Campanelli C, et al. Porokeratosis ptychotropica: A clinically distinct variant of porokeratosis [J]. J Am Acad Dermatol, 2009, 60(3):501-503.
6Takiguchi RH, White KP, White CR Jr, et al. Verrucous porokeratosis of the gluteal cleft(porokeratosis ptychotropica) a rare disorder easily misdiagnosed [J]. J Cutan Pathol, 2010, 37(7): 802-807.
7Tallon B, Blumental G, Bhawan J. Porokeratosis ptychotropica: a lesser-known variant [J]. Clin Exp Dernlatol, 2009, 34(8):e895-897.
8Scheiba N, Enk A, Proske S, et al. Porokeratosis Ptychotropica: Successful Treatment with the Den'natome [J]. Demaatol Surg, 2010, 36(2):257-260.
9Sasson M, Krain AD. Porokeratosis and cutaneous malignancy [J]. Dermatol Surg, 1996, 22(4):339-342.
