Examkin

Question

Difficulty: Very hardGynecologic Oncology

An obstetrics and gynecology consultation is requested for a 71-year-old female due to persistent perineal pruritus that has been refractory to medical management over the past 14 months. The patient reports intense, burning itchiness localized to the right labial region. She has independently applied various over-the-counter hydrocortisone and clotrimazole preparations without symptomatic relief. Her past medical history is significant for well-controlled type 2 diabetes mellitus and primary hypertension. She underwent a screening colonoscopy 11 years ago, which was normal, and her last mammogram was performed 4 years ago. Physical examination of the external genitalia reveals a 3.5-cm sharply demarcated, brightly erythematous plaque with a 'velvety' texture and scattered white, hyperkeratotic patches on the right labium majus. There are no palpable inguinal lymph nodes. A 4-mm punch biopsy of the affected area is obtained. Histopathologic analysis demonstrates large, round cells with abundant pale cytoplasm and prominent nucleoli situated within the epidermis. Immunohistochemical staining is positive for cytokeratin 7 (CK7) and periodic acid-Schiff (PAS), but negative for cytokeratin 20 (CK20) and S100. Based on these findings, what is the most appropriate next step in patient management?

  1. Perform breast imaging, colonoscopy, and cystoscopyAnswer
  2. B
    Schedule wide local excision of the vulvar lesion
  3. C
    Proceed with radical vulvectomy and bilateral lymphadenectomy
  4. D
    Initiate topical therapy with high-potency fluorinated corticosteroids
  5. E
    Perform human papillomavirus (HPV) DNA testing

Answer

Perform breast imaging, colonoscopy, and cystoscopy
The clinical presentation of a pruritic, intensely erythematous, 'velvety' plaque with hyperkeratotic white islands is classic for extramammary Paget disease (EMPD) of the vulva. The diagnosis is confirmed by the biopsy demonstrating large, pale intraepidermal Paget cells. The immunohistochemical profile (CK7-positive, PAS-positive, S100-negative) definitively distinguishes EMPD from vulvar melanoma (which would be S100-positive) and squamous cell carcinoma. While EMPD can occur as a primary intraepithelial neoplasm arising from apocrine glands, approximately 20% to 30% of cases are associated with a synchronous underlying internal adenocarcinoma, most commonly originating in the gastrointestinal tract, genitourinary tract, or breast. Because the presence of an internal malignancy significantly alters the patient's prognosis and sequence of treatments, it is mandatory to perform a comprehensive, age-appropriate screening (including colonoscopy, mammography, and cystoscopy) prior to definitive surgical excision of the vulvar lesion. This patient is overdue for both her colonoscopy and mammogram, making this systemic evaluation the critical next step.

Step-by-Step Solution

1
Interpret the clinical presentation and biopsy results.
The erythematous plaque with CK7-positive, PAS-positive, and S100-negative intraepidermal cells indicates Extramammary Paget Disease (EMPD).
These specific immunohistochemical markers differentiate EMPD from vulvar melanoma (which is S100-positive) and squamous cell carcinoma in situ.
2
Identify known systemic associations with the diagnosed condition.
Vulvar EMPD has a 20% to 30% incidence of synchronous underlying internal adenocarcinomas.
EMPD cells often represent an intraepithelial extension of an underlying glandular malignancy, most commonly from the gastrointestinal tract, genitourinary tract, or breast.
3
Determine the necessary sequential management protocol.
Systemic screening for GI, GU, and breast cancers is required prior to local excision.
Identifying a concurrent internal malignancy fundamentally alters the patient's prognosis and surgical priority, superseding immediate local treatment of the vulvar lesion.

Key Concept

Evaluation of vulvar Extramammary Paget Disease requires mandatory screening for synchronous underlying adenocarcinomas (GI, GU, and breast) prior to definitive local excision.
Rate this question

Topics

Gynecologic Oncology

More questions from this topic