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Pathology of Trichoadenoma

Dr Sampurna Roy MD




Trichoadenoma of Nikolowski is a rare, benign, well differentiated, slowly growing tumour of the hair follicle which was first described in 1958 by Nikolowski.

Site: Face and buttocks. Clinically presents as a solitary papule/nodule.

Microscopic features:


Well circumscribed dermal tumour ;

Multiple squamous islands most of which have a central cystic cavity showing epidermoid keratinization ;

Features resemble multiple cross-section of infundibular portion of hair follicles.


Verrucous trichoadenoma-  Clinically resemble seborrheic keratosis ;

Composed of small epidermoid cysts ;

Abundant keratin on the epidermal surface.

Further reading:

Trichoadenoma of an eyelid in an adult mimicking sebaceous cell carcinoma.

Verrucous trichoadenoma - presenting as discharging sinus on face.

Trichoadenoma in a mature cystic teratoma: a rare finding.

Trichoadenoma of Nikolowski is a distinct neoplasm within the spectrum of follicular tumors.

Trichoadenoma? [corrected].

Sebaceous carcinoma, basal cell carcinoma, trichoadenoma, trichoblastoma, and syringocystadenoma papilliferum arising within a nevus sebaceus.

Unusual choristoma of the parotid gland in a girl. A possible trichoadenoma.

Trichoadenoma of Nikolowski--review of four decades and seven new cases.

Trichoadenoma of the eyelid.

Trichoadenoma (Nikolowski). A clinical and histologic case report.

Trichoadenoma of Nikolowski.





Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)






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