What are the histologic findings of keratinocytes in hidradenitis suppurativa (HS)?

Updated: Nov 20, 2020
  • Author: Marina Jovanovic, MD, PhD; Chief Editor: William D James, MD  more...
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With regard to the expression of CK19 in type II epithelium and overlying epidermis in hidradenitis suppurativa lesions (which can also be induced in epidermal keratinocytes grown in organotypic culture medium with the addition of retinoic acid), study of the expression of retinoic acid and retinoid X receptors in the different epithelial phenotypes of the draining sinus would be interesting.

Retinoids are known to induce a differentiation shift in keratinocytes, which thereby acquire certain features of simple glandular epithelia. Type III epithelium expresses some markers of such epithelia. This finding may be interpreted as a kind of metaplasia toward glandular differentiation. [79] Free hair shafts can be found in the sinus and surrounding dermis, without apparent connection to the epithelium.

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