Pseudoepitheliomatous Hyperplasia in Lichen Sclerosus of the Vulva
January 2003
in “
International Journal of Gynecological Pathology
”
Studysummary This research observed that multifocal pseudoepitheliomatous hyperplasia may explain some cases of squamous nests in vulvar lichen sclerosus with lichen simplex chronicus, potentially as a reaction to tissue damage rather than squamous cell carcinoma. Our plain-language summary of this paper — not a Tressless recommendation.
The study investigated the occurrence of pseudoepitheliomatous hyperplasia (PEH) in 92 women with lichen sclerosus (LS), focusing on its frequency and histological characteristics. PEH was found in 12.1% of women with vulvar LS without carcinoma and 8.3% with carcinoma, but not in extra-anogenital LS. Two forms of PEH were identified: predominantly epidermal and predominantly follicular. PEH was associated with increased epidermal thickness, less dermal edema, more inflammation, and presence of fresh fibrin and red blood cells, suggesting it might be a reaction to tissue damage. PEH was distinguished from squamous cell carcinoma (SCC) by its lack of atypia and limited growth. The study highlighted the importance of careful diagnosis to differentiate PEH from SCC in LS cases.
