How is desquamative inflammatory vaginitis diagnosed?

Diagnosis of Desquamative Inflammatory Vaginitis (DIV)

DIV is diagnosed primarily as a diagnosis of exclusion after ruling out infectious causes, combined with specific clinical and microscopic findings including purulent discharge, vaginal erythema/petechiae, elevated vaginal pH >4.5, and wet mount showing increased parabasal cells and inflammatory cells with absent or decreased lactobacilli. 1, 2

Key Diagnostic Criteria

Clinical Presentation

DIV presents with:

• Profuse purulent vaginal discharge (though only 2% in one series had heavy discharge) 1
• Vestibulo-vaginal irritation and dyspareunia 2
• Vaginal pain (more prominent than in other vaginitides) 3

Physical Examination Findings

Look for these specific signs on speculum exam:

• Ecchymotic (petechial) findings in 54% of cases 1
• Confluent erythema of vaginal walls in 36% 1
• Diffuse exudative vaginitis with epithelial cell exfoliation 4
• Upper vaginal involvement in 8% 1

Critical caveat: The absence of heavy discharge does NOT exclude DIV—only 2% had heavy discharge in one large series 1

Laboratory Findings

Vaginal pH: Always elevated >4.5 2

Wet Mount Microscopy (essential for diagnosis):

• Increased parabasal epithelial cells (immature squamous cells indicating increased epithelial turnover) 2, 4
• Increased inflammatory cells (polymorphonuclear leukocytes) 2
• Absent or markedly decreased lactobacilli 4

Gram Stain:

• Complete or relative absence of normal long gram-positive bacilli (lactobacilli) 4
• Replacement by gram-positive cocci 4

Culture Results (often unhelpful):

• 54% had no significant abnormality on microbiological testing 1
• 20% showed pure growth of commensal organisms, most commonly group B streptococci (13 of 20 cases) 1
• No consistent pathogen identified 4

Differential Diagnosis to Exclude

You must systematically rule out these conditions before diagnosing DIV 1:

1. Infectious causes: Trichomoniasis, bacterial vaginosis, candidiasis, gonorrhea, chlamydia
2. Contact irritant vaginitis
3. Fixed drug eruptions
4. Immunobullous diseases
5. Estrogen hypersensitivity vulvovaginitis
6. Graft-versus-host disease
7. Lichen planus (important differential—only 15% have historical triggers vs 56% in DIV) 1
8. Genitourinary syndrome of menopause 5

Diagnostic Algorithm

1. Obtain history focusing on:

   • Triggers: diarrhea, recent antibiotic use, or other disruptions to vaginal homeostasis (present in 56% of cases) 1
   • Demographics: predominantly affects Caucasian women, peak in perimenopause 2

2. Perform speculum examination looking for:

   • Petechiae or confluent erythema
   • Purulent discharge characteristics
   • Extent of vaginal involvement

3. Measure vaginal pH: Must be >4.5 2

4. Perform wet mount microscopy (gold standard):

   • Look for increased parabasal cells
   • Document inflammatory cells
   • Note absence/decrease of lactobacilli

5. Obtain Gram stain if available:

   • Confirm absence of lactobacilli
   • Document gram-positive cocci replacement

6. Send cultures to exclude:

   • Trichomonas (culture more sensitive than microscopy)
   • Candida species
   • Bacterial pathogens

7. Consider therapeutic trial: If clinical suspicion is high and infectious causes excluded, response to intravaginal clindamycin (95% improvement rate) can support the diagnosis 1, 4

Important Clinical Pearls

• DIV is fundamentally a clinical diagnosis requiring careful evaluation and exclusion of other entities 1
• The condition appears to result from triggers causing shifts in vaginal homeostasis, leading to inflammatory response with increased epithelial turnover 1
• Histopathology shows epithelial erosion, plasma cells, stromal hemosiderin, lymphocyte-obscured basal layer, hemorrhage, and vascular congestion 3
• DIV and plasma cell vulvitis may represent a spectrum of the same condition (hemorrhagic vestibulovaginitis) varying by location and severity 3
• Approximately 45% require maintenance therapy after initial treatment 1