🦠microbiology review

Koilocytes

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Koilocytes are abnormal epithelial cells with a characteristic appearance, often seen in Pap smears. They are indicative of human papillomavirus (HPV) infection.

5 Must Know Facts For Your Next Test

  1. Koilocytes display a perinuclear halo and nuclear enlargement, which are hallmarks of HPV infection.
  2. They are most commonly found in the anogenital region but can also be present in other mucosal surfaces.
  3. Their presence is a key diagnostic feature for identifying HPV-related dysplasia or carcinoma.
  4. Koilocyte detection is critical for early diagnosis and management of cervical precancerous lesions.
  5. The term 'koilocyte' derives from the Greek word 'koilos,' meaning hollow, reflecting their cytoplasmic changes.

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