Pap Smear · Pathology

The 'Transformation Zone' of the cervix is the primary site for cervical carcinogenesis because it is the area where:

  1. Columnar epithelium undergoes squamous metaplasia
  2. Smooth muscle fibers progressively replace the epithelial cells
  3. The ectocervix meets the endocervical canal at the external os
  4. Physiological heavy keratinization occurs throughout this zone
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Correct answer: Columnar epithelium undergoes squamous metaplasia

The transformation zone is the area where the original squamous epithelium and the columnar endocervical epithelium meet. The process of squamous metaplasia in this region makes the cells highly susceptible to HPV integration and oncogenic transformation.

Difficulty: Medium Question 4 of 20

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