Cervical dysplasia
Persistent high-risk HPV infection drives squamous metaplasia at the cervical transformation zone into CIN 1/2/3, a histologic continuum staged by Pap cytology (Bethesda) and confirmed by colposcopic biopsy. Management follows ASCCP risk-based thresholds, from surveillance for CIN 1 to excisional or ablative treatment for CIN 2/3, to prevent progression to invasive cervical cancer.
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What this article covers
- Overview
A histologic premalignant continuum, not a cancer: cervical dysplasia, graded as cervical intraepithelial neoplasia (CIN) 1, 2, or 3, is disordered squamous growth beginning at the basal layer of the…
- Epidemiology
A disease of the sexually active reproductive years: incidence peaks in the 20s and 30s, tracking peak new HPV acquisition.
- Risk factors
Persistent high-risk HPV infection, particularly HPV-16 and HPV-18: most infections clear within 1 to 2 years, and dysplasia arises from the minority that persist.
- Pathophysiology
The transformation zone is the site of origin: the squamocolumnar junction, where columnar meets squamous epithelium, undergoes physiologic squamous metaplasia from acidic vaginal pH; this zone of…
- Clinical features
Asymptomatic in the overwhelming majority: found on a screening Pap test in a patient with no complaints; organized screening, not symptom-triggered evaluation, is the basis of detection.
- Differential diagnosis
Invasive cervical squamous cell carcinoma or adenocarcinoma: dysplasia lacks the visible ulcerated mass and biopsy-proven basement-membrane invasion of invasive disease; see cervical cancer.
- Diagnosis
The diagnosis is established histologically on colposcopic biopsy, graded as CIN 1, 2, or 3 by the fraction of epithelial thickness replaced by undifferentiated cells (basal third, basal two-thirds…
- Management
First, grade the lesion and manage CIN 1 (low-grade) with observation, not treatment.
- Complications
Progression to invasive cervical carcinoma, the principal risk of untreated or inadequately followed CIN 2/3 over years; see cervical cancer.
- Prognosis
CIN 1 regresses spontaneously in most cases within 1 to 2 years, why observation is the default.
- Prevention
Primary prevention with the 9-valent HPV vaccine: routine at age 11 to 12 (can start at 9), catch-up through age 26; a 2-dose series (0 and 6 to 12 months) if the first dose is before age 15, or…
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