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Dilated pore of Winer
Published: September 18, 2026Updated: September 18, 2026
Important: Informational content intended for healthcare professionals. It does not replace clinical evaluation or establish a doctor-patient relationship.
Overview
- Definition / synonyms
- Dilated pore of Winer (PDW) is a benign neoplasm of follicular differentiation characterized by a markedly dilated follicular infundibulum (clinically resembling a «giant comedo» with a keratin plug). Benedetto 2022 , Steffen 2001
- Synonyms used in the literature: “Winer’s dilated pore” and, in some dermatopathology texts, “infundibuloma” (a conceptual proposal that it is a true tumor of the infundibulum). Steffen 2001
- First description
- First described by Louis H. Winer in 1954 (“The dilated pore, a tricho-epithelioma”). Winer 1954
- Epidemiology
- It predominates in middle-aged and older adults , generally as a solitary lesion of the head/neck or trunk . Benedetto 2022 , Steffen 2001
- Unusual presentations include atypical locations (e.g., external auditory canal , thigh ) and multiple lesions in the vulvar region. Ayoub 2001 , Shi 2017
- ICD-10 / ICD-11 Codes
- There is no universally specific ICD code for PDW in many settings; it is usually coded according to the operational diagnosis (e.g., “epidermal/follicular cyst” or “benign skin neoplasm”) and local billing/statistics policies.
- ICD-10 (frequent suggestions): L72.0 (epidermal cyst) or L72.8 (other follicular cysts) / D23.9 (benign skin neoplasm, unspecified).
- ICD-11 (approximation): usually maps to entities of follicular disorders/cutaneous cysts or benign cutaneous neoplasms according to local catalog.
- Diagnostic checklist (quick)
- Clinical presentation: solitary large-pore lesion with keratotic plug; document duration and recent changes . Benedetto 2022
- Targeted exploration: look for atypical signs such as telangiectasias, pearly border, ulceration, or atypical pigmentation. Benedetto 2002 , Cabrera 2022
- Dermatoscopy: diagnostic support and for ruling out suspicious patterns. Moreira 2010
- Appropriate biopsy: excision or excisional punch centered on the pore and including the deep portion (avoid superficial shaving if in doubt). Alsaad 2007
- Pathology: confirm infundibular architecture with radiation; if atypia is present, further investigation is needed to rule out basal cell/squamous cell carcinoma or collision. Alsaad 2007
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