Conservative Methods of Carcinoma Cervix (Fertility-Sparing Treatment)

General Patient Selection Criteria

• Desire for future fertility
• Early FIGO stage (IA1 to IB2)
• Adequate surgical margins feasible
• No lymphovascular space invasion (LVSI) in lower-stage options
• Negative lymph node status (confirmed by sentinel node biopsy or pelvic lymphadenectomy)
• Negative imaging for metastatic disease (MRI/PET-CT)
• Tumor size within specified limits

1. Cryosurgery / Laser Ablation

• Cryosurgery uses a cold metal probe to freeze and destroy abnormal cells
• Laser ablation (CO2 laser) vaporizes abnormal tissue through the vagina
• These are ablative (not excisional), so no specimen for margin assessment
• Not suitable if there is any invasive component or glandular disease
• Recurrence surveillance with close follow-up colposcopy is mandatory

2. LEEP (Loop Electrosurgical Excision Procedure)

• A thin wire loop carries electric current to excise a cone-shaped tissue sample
• Provides a histological specimen (unlike ablation)
• Often diagnostic and therapeutic simultaneously for microinvasive disease
• Adequate when margins are negative; repeat excision needed if margins involved

3. Cervical Conization (Knife Cone Biopsy)

• Conization alone is definitive treatment
• Requires 3 mm negative resection margin
• Risk of pelvic node metastasis is <1%, so lymph node staging is not mandatory
• A large Japanese series of 200 stage IA1 SCC patients treated with laser conization showed zero recurrences at median 117 months follow-up
• Also applied to stage IA1 adenocarcinoma in selected centers

• Conization + pelvic lymph node staging (sentinel node biopsy or pelvic lymphadenectomy)
• If margins are negative and nodes are negative, conization can be sufficient

4. Simple (Non-Radical) Trachelectomy + Lymph Node Staging

• Squamous cell carcinoma (any grade) or adenocarcinoma grade 1-2
• Tumor size ≤2 cm
• No LVSI
• Depth of invasion ≤10 mm
• Conization margins and endocervical curettage negative for malignancy or high-grade dysplasia
• Negative imaging

• Surgical approach: vaginal or laparoscopic
• Isthmus-uterine anastomosis is performed + cerclage placement
• Obstetric outcomes: good, but preterm birth risk is elevated

5. Radical Trachelectomy + Pelvic Lymphadenectomy

Types:

Surgical Steps (Radical Trachelectomy):

1. Pelvic lymphadenectomy (or sentinel node biopsy) - intraoperative frozen section
2. If nodes positive - abandon fertility-sparing plan, proceed to radical hysterectomy or chemoradiation
3. Excision of cervix + 1-2 cm of vaginal cuff + parametria
4. Anastomosis of uterine isthmus to vaginal cuff
5. Permanent cerclage placement (Shirodkar or McDonald)

Mandatory margin requirement:

• Non-fragmented specimen with ≥1 mm histological tumor-free margin from carcinoma or dysplasia

Outcomes:

• Compared with women who underwent conization, radical hysterectomy leads to worse sexual function; radical trachelectomy preserves better quality of life - Berek & Novak's Gynecology
• Pregnancy is achievable post-trachelectomy; prophylactic cerclage supports cervical competence (ultrasound surveillance required)

6. Neoadjuvant Chemotherapy + Conservative Surgery

• Platinum-paclitaxel-based regimens used to downsize tumor
• Followed by conization or simple/radical trachelectomy
• Retrospective data suggest abdominal radical trachelectomy has the lowest recurrence rate for IB2
• Ongoing prospective trials are clarifying validity - not yet standard of care

Summary Table

Follow-Up After Conservative Treatment

• Pap smear + HPV co-testing every 6 months for 2 years, then annually
• Colposcopy for any abnormality
• MRI if recurrence suspected
• Obstetric surveillance: cervical length monitoring, early delivery planning (most deliver at 34-37 weeks by cesarean)

• Goldman-Cecil Medicine, Chapter 184: "In limited situations in which preservation of fertility is desired, a radical trachelectomy (removal of the cervix only) can be performed." Conization or LEEP may be sufficient for women with microscopic disease.
• Berek & Novak's Gynecology: Nerve-sparing and conservative approaches associated with better sexual function outcomes vs radical hysterectomy.
• ESGO Pocket Guidelines on Fertility-Sparing Treatment in Gynaecological Cancers (2025)
• CancerNetwork - Fertility Preservation in Cervical Cancer

Intraoperative specimen of radical vaginal trachelectomy showing the excised cervix with parametrial tissue and clear resection margins

Transvaginal ultrasound demonstrating successful intrauterine pregnancy after radical abdominal trachelectomy, with prophylactic cerclage (hyperechoic band) visible at the base of the uterus

Conization in Carcinoma Cervix

Definition

• The entire transformation zone (TZ)
• The squamocolumnar junction (SCJ)
• A portion of the endocervical canal (ECC)
• The entire lesion surrounded by uninvolved (negative) margins

Types of Conization

Variation in Cone Shape

• Premenopausal women: Lesions are mostly ectocervical. Cone should have a broad base and wide angle at the top (Fig A)
• Postmenopausal women: SCJ has retreated into the ECC; lesions are more endocervical. Cone should be long, narrow, with an acute angle at the top (Fig B)

Indications

For Diagnosis:

1. Inadequate colposcopic evaluation (lesion not fully visualized)
2. Lesion not seen on colposcopy but Pap smear is significantly abnormal
3. Incomplete visualization - lesion extends into the ECC
4. Squamocolumnar junction not fully visualized (retreated into os)
5. Positive endocervical curettings (dysplasia or cancer on ECC)
6. Discrepancy between cytology, histology, and colposcopic impression (Pap smear ≥2 grades worse than biopsy)
7. Inability to exclude invasive cancer on colposcopy

For Therapy (and/or Staging):

1. Cytology/biopsy suggests microinvasive carcinoma (must rule out frank invasion - also potentially therapeutic)
2. Stage IA1 without LVSI - conization alone is definitive treatment; <1% lymph node risk
3. Stage IA1 with LVSI / Stage IA2 - conization + lymph node staging
4. High-grade dysplasia (CIN 2/3) >2 cm or involving >2 quadrants
5. Cryotherapy contraindicated or lesion too large for cryotip
6. Markedly irregular cervical surface that cryotherapy won't reach
7. Glandular involvement on biopsy (relative indication)
8. Lesion extends >5 mm into the os
9. Non-compliance (patient unlikely to follow up after lesser treatment)
10. Correction of cervical stenosis

Contraindications

Absolute:

• Known frank invasive carcinoma (Stage IB+) - conization is insufficient; radical surgery/chemoradiation needed
  • Note: Carcinoma in situ is NOT frank invasion - it is severe dysplasia and conization IS appropriate
  • For microinvasive cancer, conization is needed to RULE OUT frank invasion
• Contraindications to general or regional anesthesia
• Unstable medical conditions (rarely applicable)

Relative:

• Unstable bleeding disorders
• Inflammatory cervicitis (increases bleeding risk)
• Heavy menses at time of surgery
• Pregnancy - only trained physicians capable of managing complications should proceed

Equipment Required

• Povidone-iodine solution
• Colposcope with green filter
• Acetic acid and Lugol's solution (full strength)
• Vasopressin 20 U in 20 mL normal saline (for intrastromal injection)
• Long scalpel handle with No. 11 blade
• Long fine-tooth forceps
• Kevorkian endocervical curette
• Electrocautery unit
• O-chromic or O-Vicryl suture (Surgicel/Gelfoam/Avitene for hemostasis)
• Large Graves speculum
• Uterine sound

Step-by-Step Procedure (Cold-Knife Conization)

1. Anesthesia - General, local (intrastromal), or regional; drain the bladder
2. Lesion mapping - Apply full-strength Lugol's solution (Schiller's test); all Lugol's-negative (non-staining) areas must be included in the cone. OR use acetic acid + colposcopy with green filter
3. Hemostasis preparation - Circumferentially infiltrate the cervical stroma with vasopressin 20 U in 20 mL saline (intracervical injection - Fig 134-2)
4. Sound the uterus - Determine uterine position and size
5. Circular incision - Start at the 6 o'clock position (prevents blood obscuring the incision line). Angle the blade centrally toward the cervical canal at the required depth
6. Tissue elevation - Use fine-tooth forceps to elevate the cone away from its bed without damaging the epithelium
7. Specimen orientation - Mark the 12 o'clock position with a single suture into the stroma for the pathologist
8. Measure the specimen before fixation (it shrinks before the pathologist measures it)
9. ECC curettage - Curette the remaining ECC above the upper margin of the cone to rule out residual disease
10. D&C - If indicated, perform at this time
11. Hemostasis - Superficial electrocoagulation (ball electrode), suture ligatures, or absorbable gelatin sponge (Gelfoam) packing
12. Fix specimen - Send cone in fixative for pathologic examination

Margin Assessment and Oncological Adequacy

Role of Conization by FIGO Stage

Complications

• Fetal loss rate: 10% (rupture of membranes, preterm labor, hemorrhage)
• Postoperative hemorrhage rate: 30%

Post-Procedure Management

• Follow-up appointment at 4-6 weeks
• Avoid intercourse, douching, tampon use until healing confirmed at follow-up
• Notify clinician of: fever, excessive vaginal bleeding, purulent discharge
• First follow-up Pap smear: 3-4 months after procedure if all margins are clear
• Subsequent surveillance: Pap + HPV co-testing every 6 months for 2 years, then annually

Histopathology Images

Histopathology of a cone biopsy specimen showing adenocarcinoma in situ (AIS) with concurrent CIN - demonstrating the importance of cone biopsy for margin assessment and multi-lineage neoplasia detection

MRI post-conization in Stage IA1 cervical cancer: T2-weighted image (left) shows characteristic cone-shaped tissue defect (asterisk) with peri-lesional inflammatory changes (arrowheads); delayed contrast image (right) shows hematoma filling the defect - used to differentiate post-surgical changes from residual tumor

• Pfenninger & Fowler's Procedures for Primary Care, 3rd Ed - Full procedural protocol
• Creasy & Resnik's Maternal-Fetal Medicine - Conization in pregnancy
• Goldman-Cecil Medicine - Role of conization in cervical cancer staging/treatment
• Histology: A Text and Atlas (Mescher) - Cervical cancer and HPV context
• ESGO Pocket Guidelines: Fertility-Sparing Treatment in Gynaecological Cancers (2025) - Margin requirements and stage-specific recommendations