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Plasma Cell Vulvitis: A Classification Into Two Clinical Phenotypes.

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Plasma cell vulvitis (PCV) presents as two distinct types: primary, localized to the vestibule, and secondary, involving both vestibule and external areas. This classification of PCV may guide treatment strategies.

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Area of Science:

  • Gynecology
  • Dermatology
  • Pathology

Background:

  • The etiology of plasma cell vulvitis (PCV) remains debated.
  • Understanding distinct PCV phenotypes is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To investigate the hypothesis that plasma cell vulvitis (PCV) can be classified into two distinct clinical phenotypes.
  • To differentiate between non-lichen-associated (primary) and lichen-associated (secondary) PCV.

Main Methods:

  • Retrospective study of patients with a clinico-pathological diagnosis of PCV and available vulvar photographs.
  • Classification of PCV cases into primary (non-lichen-associated) and secondary (lichen-associated) groups.
  • Comparison of groups based on age, menopausal status, PCV location, and histological parameters using Fisher exact test.

Main Results:

  • Thirty-five patients were included: 20 primary PCV and 15 secondary PCV.
  • Primary PCV predominantly involved the vestibule, while secondary PCV was often extravestibular.
  • Secondary PCV showed significantly more frequent epidermal atrophy, parakeratosis, neutrophils, and eosinophils histologically.

Conclusions:

  • Plasma cell vulvitis (PCV) can be clinically divided into two phenotypes: primary non-lichen-associated and secondary lichen-associated.
  • Primary PCV, restricted to the vestibule, may represent the vulvar equivalent of atrophic vaginitis.
  • Secondary PCV, affecting both vestibular and extravestibular areas, exhibits specific histological features and may require broader diagnostic consideration.