Oncology · Gynecologic Oncology
The facts most likely to be tested
Squamous cell carcinoma is the most common histologic subtype of vulvar cancer, typically presenting as a persistent vulvar pruritus or a vulvar mass/ulcer.
Human papillomavirus (HPV) infection, specifically high-risk types 16 and 18, is the primary risk factor for the basaloid/warty subtype of vulvar squamous cell carcinoma.
Lichen sclerosus is the classic chronic inflammatory dermatosis associated with the development of differentiated-type vulvar intraepithelial neoplasia (dVIN) and subsequent keratinizing squamous cell carcinoma.
Inguinal lymph node status is the most important prognostic factor for survival in patients with invasive vulvar cancer.
Punch biopsy of any suspicious, non-healing vulvar lesion is the mandatory diagnostic step to confirm the diagnosis and determine the depth of invasion.
Radical local excision with sentinel lymph node biopsy is the preferred surgical management for early-stage disease to minimize the morbidity of complete inguinofemoral lymphadenectomy.
Postmenopausal women with a history of chronic vulvar irritation or lichen sclerosus represent the highest-risk demographic for developing vulvar malignancy.
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A 72-year-old female presents to the clinic complaining of a 6-month history of intense vulvar pruritus and burning. Physical examination reveals a thickened, white, plaque-like lesion on the left labia majora with an associated exophytic, ulcerated mass. She has a long-standing history of lichen sclerosus that has been poorly controlled. A punch biopsy of the lesion is performed.
Which of the following is the most likely underlying pathophysiology for this patient's condition?
Differentiated-type vulvar intraepithelial neoplasia (dVIN)
The patient's history of lichen sclerosus is strongly associated with dVIN, which progresses to keratinizing squamous cell carcinoma, distinct from the HPV-related pathway.
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Etiology / Epidemiology
Primarily postmenopausal women; HPV-16/18 infection is the primary driver in younger patients, while chronic lichen sclerosus drives cases in older patients.
Clinical Manifestations
Presents as a pruritic, persistent vulvar lump or ulcer; leukoplakia or erythroplakia are classic visual findings.
Diagnosis
Punch biopsy is the gold standard for definitive diagnosis of all suspicious vulvar lesions.
Treatment
Radical local excision with sentinel lymph node biopsy is the primary management for early-stage disease.
Prognosis
The depth of invasion is the most significant prognostic factor; 5-year survival is ~80% for localized disease.
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Epidemiology & Etiology
Squamous cell carcinoma accounts for 90% of cases. Risk factors include smoking, HPV infection, and chronic inflammatory conditions like lichen sclerosus. Incidence peaks in the 7th decade of life.
Pertinent Anatomy
The vulva is highly vascularized, facilitating early lymphatic spread to the inguinal lymph nodes. Lesions often arise on the labia majora.
Pathophysiology
Progression typically follows a sequence from vulvar intraepithelial neoplasia (VIN) to invasive carcinoma. HPV-associated pathways involve viral oncogenes E6/E7, while non-HPV pathways are driven by chronic inflammation and p53 mutations.
Clinical Manifestations
Patients often report a long history of pruritus and burning. Physical exam reveals a raised, ulcerated, or warty lesion. Any persistent vulvar lesion in a postmenopausal woman must be biopsied to rule out malignancy.
Diagnosis
A punch biopsy is mandatory for any suspicious, non-healing lesion. Imaging such as CT or MRI of the pelvis is utilized for staging to assess for lymph node involvement.
Treatment
Surgical resection is the mainstay. Radical local excision is preferred for early stages. Avoid radical vulvectomy unless necessary due to high morbidity. Adjuvant radiation therapy is indicated for positive margins or multiple positive lymph nodes.
Prognosis
Prognosis is strictly dependent on lymph node status and tumor size. Patients require lifelong surveillance due to the risk of local recurrence.
Differential Diagnosis
Lichen sclerosus: characterized by cigarette paper skin atrophy
Condyloma acuminata: usually soft, fleshy, and non-ulcerated
Paget disease of the vulva: presents as eczematous, red, velvety plaques
Syphilitic chancre: typically painless, indurated ulcer
Bartholin cyst: fluctuant mass located at the 4 or 8 o'clock position