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J Cutan Pathol. 2010 Jul;37(7):802-7. doi: 10.1111/j.1600-0560.2009.01387.x. Epub 2009 Jul 21.

Verrucous porokeratosis of the gluteal cleft (porokeratosis ptychotropica): a rare disorder easily misdiagnosed.

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1
Department of Dermatology, Oregon Health and Science University, 3303 SW Bond Avenue, CH16D Portland, OR 97239, USA. takiguch@ohsu.edu

Abstract

Porokeratosis represents a heterogeneous group of disorders characterized clinically by a distinctive ridge-like border and histologically by cornoid lamellae. A verrucous variant of porokeratosis involving the gluteal cleft has been recently described. We present 5 new cases and review the current literature to highlight the clinical and histopathologic features of this disorder. Descriptive terms including hyperkeratotic porokeratosis, genitogluteal porokeratosis, porokeratoma, follicular porokeratosis, and porokeratosis ptychotropica have all been used to describe this verrucous variant of porokeratosis involving the gluteal cleft. To avoid further confusion, we propose a consolidation of terminologies and suggest verrucous porokeratosis be added to the commonly described variants of porokeratosis.

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