Gynecologic Cytology

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Cervical Screening & Sampling - The First Look

  • Pap Smear Types:
    • Conventional: Direct smear.
    • Liquid-Based Cytology (LBC): Cells in preservative, processed.
  • Sampling Tools:
    • Ayre Spatula: Ectocervix.
    • Cytobrush: Endocervix.
    • Cervex-Brush (Combi): Ecto- & endocervix.
  • Fixation: Immediate 95% ethanol or spray fixative.
  • Adequacy (Bethesda): ≥ 5,000 squamous cells; endocervical/transformation zone (EC/TZ) component present. Cervical sampling tools

⭐ LBC reduces obscuring elements like blood and mucus, improving sensitivity and allowing ancillary testing (e.g., HPV DNA).

Benign & Reactive Changes - Not Always Scary

  • Normal Cells: Squamous (superficial, intermediate, parabasal), endocervical, endometrial.

  • Reactive Changes: Inflammation (PMNs, lymphocytes), repair, atrophy.

  • Common Infections:

    OrganismKey Features
    CandidaPseudohyphae, spores
    TrichomonasPear-shaped, flagella
    GardnerellaClue cells (bacteria obscuring cell borders)
    Actinomyces"Sulfur granules" (dense bacterial colonies)
    HSV📌 3 M's: Multinucleation, Molding, Margination
    HPVKoilocytes (perinuclear halo, nuclear atypia)

Koilocytes in cervical cytology

⭐ Koilocytic atypia, characterized by nuclear atypia and a perinuclear halo, is pathognomonic for HPV infection.

Bethesda System - Decoding Reports

The Bethesda System (TBS) 2014 standardizes gynecologic cytology reporting.

  • Specimen Adequacy: Assesses sample quality.
    • Satisfactory for evaluation: Requires endocervical/transformation zone (EC/TZ) component. Minimum 5,000 cells (LBC), 8,000-12,000 (conventional).
    • Unsatisfactory for evaluation: Reasons provided (e.g., scant cellularity, obscuring factors).
  • General Categorization: Main diagnostic groups.

⭐ Presence of an adequate endocervical/transformation zone (EC/TZ) component is crucial for a satisfactory Pap smear.

Squamous Abnormalities - SILs & Squawks

CategoryN/C RatioChromatinNuclear MembraneCell Shape / Other
ASC-USSl. ↑FineSmoothSuperficial/Intermediate; Atypia, not LSIL/HSIL
ASC-H↑ (>0.5)Fine/CoarseSmooth/IrregularSmaller, metaplastic-like; Cannot exclude HSIL
LSIL↑ (often <0.5)Fine, smudgedSmooth/IrregularSuperficial/Intermediate; Koilocytosis (HPV), CIN 1
HSIL↑↑ (>0.7)Coarse, hyperIrregularSmaller, round/oval; CIN 2/3, CIS

Cytomorphology of Gynecologic Cytology Cells

⭐ p16INK4a immunostain is typically positive in HSIL, aiding differentiation from mimics such as reactive changes or atrophy.

Glandular Abnormalities - Glands Gone Rogue

Endocervical adenocarcinoma in situ with feathering

⭐ "Feathering", elongated nuclei, and pseudostratification are characteristic features of Endocervical Adenocarcinoma In Situ (AIS).

CategoryKey Cytomorphologic Features
AGC-NOSCell crowding, nuclear overlap, mild atypia. (Endocervical/Endometrial origin)
AGC-FN↑Crowding/overlap, significant atypia; rosettes, feathering suggestive of neoplasia.
AISFeathering, rosettes, pseudostratification, elongated hyperchromatic nuclei.
Adeno-Ca3D clusters, single cells, macronucleoli, tumor diathesis. (Endocervical/Endometrial/Extrauterine)

Management Pathways - Charting the Course

⭐ For women with ASC-US, HPV DNA testing is the preferred management approach to triage for colposcopy.

High‑Yield Points - ⚡ Biggest Takeaways

  • Bethesda System (TBS) is crucial for reporting cervical cytology.
  • High-risk HPV (16, 18) are major causes of cervical cancer.
  • Koilocytes (perinuclear halo, nuclear atypia) are pathognomonic for HPV.
  • LSIL often regresses; HSIL carries significant risk of progression to invasive cancer.
  • ASC-US is the most common abnormality; requires HPV testing or repeat cytology.
  • AGC (Atypical Glandular Cells) necessitates evaluation for endocervical or endometrial lesions.
  • Conventional Pap smears and Liquid-Based Cytology (LBC) are primary screening tools.

Practice Questions: Gynecologic Cytology

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Which one of the following is NOT a characteristic feature of bacterial vaginosis?

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Flashcards: Gynecologic Cytology

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According to the Bethesda system (Thyroid cytopathology), what is the preferred line of Mx for Criteria VI?_____

TAP TO REVEAL ANSWER

According to the Bethesda system (Thyroid cytopathology), what is the preferred line of Mx for Criteria VI?_____

Total thyroidectomy

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