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High-Grade Pap Smear (HSIL): Meaning, Workup, and Management

High-grade squamous intraepithelial lesion (HSIL) on cervical cytology indicates moderately to severely abnormal cells with significant potential to progress to cervical cancer if untreated. It corresponds to CIN 2/3 on histology.

What It Means

  • Not cancer. Precancerous changes confined to epithelium.
  • Progression risk: CIN 2: ~20–30% regress, ~20% progress to CIN 3, ~1% to cancer. CIN 3: ~30% progress to cancer over years if untreated.
  • HPV association: Nearly 100% HPV-positive (types 16, 18, 31, 33, 45, 52, 58).

Recommended Workup (ASCCP 2019 Guidelines)

  1. Colposcopy with biopsy: Gold standard. Visualizes transformation zone; targets acetowhite lesions.
  2. Endocervical sampling: If type 3 TZ or age ≥25.
  3. HPV genotyping (if not done): 16/18 positive → higher risk.

Management by Histology

Biopsy ResultAge 25+Age 21–24
CIN 2,3 (HSIL)Excision (LEEP/cone) preferred. Ablation acceptable if criteria met.Observation (colposcopy q6mo × 2 yr) acceptable; excision if persistent/progressive.
CIN 1 (LSIL)Observation.Observation.
Surveillance per HPV result.Surveillance.

Excisional Procedures

  • LEEP (LLETZ): Loop electrosurgical excision — office-based, local anesthesia.
  • Cold knife cone: OR, if adenocarcinoma in situ (AIS) suspected, endocervical involvement, or LEEP inadequate.

Follow-Up

  • Co-testing (cytology + HPV) at 12 and 24 months post-treatment.
  • If both negative ×2 → return to routine screening (5-yr intervals).
  • HPV persistence → colposcopy.

Fertility and Pregnancy

LEEP may slightly ↑ risk of preterm birth (cervical shortening). Discuss with OB. Cone biopsy higher risk. Surveillance preferred in young women without high-grade histology.

HSIL is treatable with excellent outcomes. Adherence to follow-up is critical.

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