Dilated Pore of Winer Workup
- Author: Alyssa Y Kim, MD; Chief Editor: Dirk M Elston, MD more...
Dermoscopic examination shows a pinkish nodule with peripheral vessels in a regular pattern. The individual vessels at the periphery of the lesion extend towards the center. The size of the vessels decreases with every progressive branching. The center of the lesion reveals a dilated ostium filled with terminal hairs.
Histologic examination of a biopsy specimen from the lesion is the only way to make a definitive diagnosis.
A dilated follicular infundibulum extends deep into the dermis and, at times, into the subcutaneous tissue. The cavity is lined by the epidermis, which is atrophic near the follicular ostium. The epidermis is hypertrophic and proliferative in the deeper portion of the invagination where the numerous rete ridges project into the surrounding stroma. The cavity is filled with laminated keratin. Vellus hair follicles and small sebaceous lobules may be attached to the lower portion of the infundibulum. Gonzalez-Guerra et al reported in 2008 that cutaneous adnexal tumors of the hair follicle can be identified using immunohistochemistry studies for calretinin, with differentiation towards cells of the outer root sheath.
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