Dilated pore of Winer pathology

Author: Dr Ben Tallon, Dermatologist/Dermatopathologist, Tauranga, New Zealand, 2012.

This lesion falls within the group of benign follicular tumours.

Histology of dilated pore of Winer

Scanning power view of dilated pore of Winer demonstrates a small invaginating epidermal process (Figure 1). This is comprised of a widened follicular infundibulum filled with a small amount of keratinous material (Figure 2). The infundibular epithelium is hyperplastic, forming small radiating strands at the base and sides of the pore (Figure 2).

Differential diagnosis of dilated pore of Winer

Pilar sheath acanthoma: In this lesion there is more prominent hyperplasia of the outer root sheath forming tumour nodules which push into the surrounding dermis. This tumour arises from the follicular isthmus where the corneocytes take on a more red-pink colour.

Trichofolliculoma: Radiating hair follicles in variable states of maturity are seen to extend from the central dilated pore or cystic structure.

Hair cortex comedo : This lesion demonstrates infundibular epithelium associated with a dense cornified plug with compact laminated corneocytes, and matrical and supramatrical epithelium representing attempts to form the hair cortex and shaft.

Related information

Email Newsletter

Would you like to receive our dermatology updates by email?

SIGN UP

Submit your images

We're seeking high-quality photos of skin diseases.  

SUBMIT A PHOTO

Machine diagnosis

Watch DermNet's proposal to create a 'Skin Disease Image Recognition Tool' - winner of the 2017 'Clinicians' Challenge Active Award' by the NZ Ministry of Health and HiNZ.

Subscribe to our mailing list

* indicates required
DermNet NZ Newsletter