Pap Smear · Pathology

A Pap smear showing 'LSIL' (Low-grade Squamous Intraepithelial Lesion) corresponds to which histological grade?

  1. CIN 1
  2. CIN 2
  3. CIN 3
  4. Carcinoma in situ
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Correct answer: CIN 1

LSIL is the cytological equivalent of Cervical Intraepithelial Neoplasia grade 1 (CIN 1). It reflects the cytopathic effects of HPV infection and typically involves the lower third of the epithelium.

Difficulty: Medium Question 11 of 20

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