Infectious Disease· Topic 7.10 Organ-system complications of HIV infection· 7.10.14

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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