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Difficulty: Very hardGynecologic Infections

A 32-year-old woman with poorly controlled type 2 diabetes mellitus comes to the clinic reporting severe vulvovaginal burning and irritation that has persisted for the past 3 weeks. She has been treated with two separate courses of oral fluconazole and a 7-day course of over-the-counter topical miconazole with no relief. Her last hemoglobin A1c was 8.7%. Pelvic examination reveals significant vulvovaginal erythema and edema with a few superficial excoriations. There is a moderate amount of thin, whitish vaginal discharge. The vaginal pH is 4.3. Microscopic evaluation of the discharge with saline and 10% potassium hydroxide (KOH) preparations reveals numerous inflammatory cells and small budding yeasts, but no pseudohyphae are identified. Which of the following is the most appropriate next step in management?

  1. Obtain a vaginal fungal culture and initiate treatment with intravaginal boric acidAnswer
  2. B
    Initiate a 14-day induction course of daily oral fluconazole followed by a weekly maintenance dose
  3. C
    Perform a vulvar punch biopsy to evaluate for a malignant or inflammatory dermatosis
  4. D
    Prescribe a 7-day course of oral metronidazole
  5. E
    Advise the use of over-the-counter 1% hydrocortisone cream and sitz baths

Answer

The most appropriate next step is to obtain a vaginal fungal culture and initiate treatment with intravaginal boric acid.
The correct answer involves obtaining a fungal culture and initiating intravaginal boric acid. This patient's presentation of severe vulvovaginal burning, a normal vaginal pH (< 4.5), and a KOH prep showing budding yeast without pseudohyphae is classic for a non-albicans Candida infection, most commonly Candida glabrata. Poorly controlled diabetes mellitus is a significant risk factor for C. glabrata. Unlike Candida albicans, which forms both budding yeast and pseudohyphae, C. glabrata typically only forms spores (budding yeast). Furthermore, C. glabrata frequently exhibits intrinsic resistance to standard azole therapies (e.g., fluconazole, miconazole). When a patient fails standard azole therapy and lacks pseudohyphae on microscopy, a fungal culture is required for definitive speciation, and treatment should be transitioned to intravaginal boric acid capsules or topical flucytosine for 14 days.

Step-by-Step Solution

1
Analyze the clinical history and physical exam findings.
The patient is a diabetic woman with refractory vulvovaginal burning, severe erythema, and a normal vaginal pH (4.3).
Establishes that the underlying condition is most likely a yeast infection, as bacterial vaginosis and trichomoniasis typically present with an elevated vaginal pH > 4.5.
2
Interpret the microscopic evaluation (KOH prep).
Microscopy shows small budding yeasts but NO pseudohyphae.
Differentiates Candida albicans (which consistently forms both budding yeast and pseudohyphae) from non-albicans species like Candida glabrata (which only forms budding yeast/spores).
3
Synthesize the treatment failure and microscopic findings to select the appropriate pharmacotherapy.
Identify that the patient has an azole-resistant C. glabrata infection requiring fungal culture for speciation and intravaginal boric acid for effective treatment.
Standard azoles (fluconazole, miconazole) are highly ineffective against C. glabrata due to intrinsic resistance; boric acid or topical flucytosine are the recommended first-line alternatives.

Key Concept

Diagnosis and management of non-albicans vulvovaginal candidiasis (Candida glabrata)
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Topics

Gynecologic Infections

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