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Sentinel Lymph Node Mapping in Gynecologic Oncology

Targeted nodal evaluation in endometrial, cervical and vulvar cancers

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Kadın Hastalıkları ve Doğum department. Book Appointment →

What is Sentinel Lymph Node Mapping in Gynecologic Oncology?

Sentinel lymph nodes are the first lymph nodes to receive lymphatic drainage from a primary tumor and are the most likely site of initial metastatic spread.

Mapping involves injecting tracers (blue dye, technetium-99m radiocolloid or indocyanine green/ICG) into the cervix or tumor and tracking lymphatic flow.

ICG with near-infrared fluorescence imaging has become the preferred method due to higher detection rates and bilateral mapping success.

If sentinel nodes are pathologically negative, the patient avoids the morbidity of complete pelvic and para-aortic lymphadenectomy.

Indications: early-stage endometrial cancer (any grade), early cervical cancer (stage IA1 with LVSI through IIA), early vulvar cancer with tumor less than 4 cm and no clinically suspicious nodes.

Symptoms

Indications for SLN mapping driven by clinical stage and risk factors of the gynecologic cancer
Pre-operative: cancer diagnosis with staging workup including imaging and biopsy
Procedural sensations: pelvic discomfort similar to laparoscopy or open surgery
Post-operative: minimal additional symptoms compared to traditional lymphadenectomy due to less extensive dissection
Reduced lymphedema, lymphocele, neuropathy and operative time compared to systematic lymphadenectomy

Risk Factors

Indications: low- to intermediate-risk endometrial cancer (grade 1–2 endometrioid, presumed early stage), early cervical cancer with tumor up to 4 cm, T1–T2 vulvar cancer with no clinically suspicious nodes
Risks: failed mapping (5–15 percent, more in obese patients or after prior pelvic surgery), allergic reaction to dye, lymphatic injury, false-negative result
Patient factors that may reduce mapping success: high BMI, prior pelvic surgery, prior radiation, large tumor
Contraindications: extensive metastatic disease, suspicious nodes on imaging, large tumor exceeding criteria

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Postoperative fever, chills or signs of infection
  • Pelvic pain or persistent abdominal discomfort beyond expected recovery
  • Leg swelling, redness or pain (signs of lymphedema or thrombosis)
  • Wound complications, drainage or dehiscence
  • Dyspnea, chest pain (rare pulmonary complications)
  • Allergic reaction symptoms after dye injection
  • Recurrence symptoms during long-term follow-up

Treatment Methods

01
Pre-operative imaging: MRI for cervical and endometrial cancer, CT for vulvar cancer; assess nodal status
02
Multidisciplinary planning: gynecologic oncology, pathology, radiology to confirm SLN candidacy
03
Tracer injection: cervical injection at 3 and 9 o'clock positions for endometrial and cervical cancer; peritumoral injection for vulvar cancer
04
ICG with near-infrared fluorescence is preferred; alternatively combination of blue dye and radiocolloid
05
Identify and excise all sentinel nodes; if mapping fails on a hemipelvis, perform side-specific lymphadenectomy
06
Ultrastaging of sentinel nodes with multiple sectioning and immunohistochemistry to detect micrometastases and isolated tumor cells
07
Side-specific lymphadenectomy if mapping fails or nodes appear suspicious; complete lymphadenectomy if SLN positive (controversial in some scenarios)
08
Adjuvant therapy decisions guided by sentinel node status, stage, grade and other risk factors
09
Post-operative monitoring: standard cancer surveillance, lymphedema prevention exercises, prompt management of complications
10
Long-term follow-up with imaging and clinical examination per cancer-specific guidelines

Which Department to Visit?

You can visit our Kadın Hastalıkları ve Doğum department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.