Histopathologic features of vulvar vestibulitis

Area of Science:

• Gynecologic pathology
• Vulvar diseases
• Immunohistochemistry

Background:

• Vulvar vestibulitis, a subset of vulvodynia, affects 15% of patients in general gynecologic practices.
• Limited research exists on the pathologic features of vulvar vestibulitis, with no prior studies including a control group.

Purpose of the Study:

• To analyze histopathologic features of vulvar vestibulitis.
• To investigate potential etiologic factors, including human papillomavirus (HPV), in vulvar vestibulitis.
• To compare histopathologic findings between patients with vulvar vestibulitis and age-matched controls.

Main Methods:

• Analysis of punch biopsies from the vulvar vestibule of 12 patients with vestibulitis and 12 age-matched controls.
• Histopathologic examination for inflammatory infiltrates, glandular abnormalities, squamous metaplasia, and epithelial hyperplasia.
• Immunohistochemistry for immunoglobulins (IgG, IgA, IgM) and in situ hybridization for HPV types 6, 11, 16, and 18.

Main Results:

• All vestibulitis patients exhibited a chronic inflammatory infiltrate (mild, moderate, or severe), predominantly T-lymphocytes, with normal T-helper suppressor ratios.
• Minor vestibular glands, squamous metaplasia, and epithelial hyperplasia were observed in a significant percentage of patients.
• HPV was not detected in any patient or control samples; IgG-positive plasma cells were present in 75% of patients, suggesting chronic irritation.

Conclusions:

• Histopathologic abnormalities in vulvar vestibulitis are characterized by a chronic inflammatory reaction of the vulvar vestibule mucosa.
• The specific cause of this chronic inflammation in vulvar vestibulitis remains undetermined.
• Autoimmune etiology cannot be excluded or confirmed based on current findings.