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Sentinel node localization should be interpreted with caution in midline vulvar cancer.
Christine Louis-Sylvestre1, Eva Evangelista, Franck Leonard
1Department of Gynecology, Service de Gynécologie, Centre Hospitalier Intercommunal 40 Avenue de Verdun, 94000 Créteil, France. christine.louissylvestre@chicreteil.fr
Gynecologic Oncology
|March 26, 2005
Summary
Sentinel node identification in midline vulvar cancer is crucial. Bilateral lymph node assessment is recommended, as unilateral findings do not rule out metastasis in the contralateral groin.
Area of Science:
- Gynecologic Oncology
- Surgical Pathology
- Nuclear Medicine Imaging
Background:
- Midline vulvar tumors are presumed to have bilateral lymphatic drainage.
- Accurate staging of vulvar cancer requires precise lymph node assessment.
Purpose of the Study:
- To evaluate the effectiveness of sentinel node identification in vulvar carcinomas located on or near the midline.
- To determine if unilateral sentinel node detection is sufficient for staging these tumors.
Main Methods:
- Prospective study of 17 patients with operable, midline vulvar cancer.
- Sentinel node identification using (99m)Tc-labelled nanocolloid with lymphoscintigraphy and intraoperative probe.
- Optional intraoperative blue dye, followed by radical excision and bilateral lymphadenectomy.
Main Results:
- Sentinel nodes were identified in all 17 patients (21/34 groins).
- 5 patients had metastatic sentinel nodes; no false negatives were observed.
- Unilateral drainage was suggested in 13 patients, but 3 had undetected metastatic nodes in the contralateral groin.
Conclusions:
- Unilateral sentinel node identification in midline vulvar tumors can be misleading.
- Metastatic disease may be present in the contralateral groin even with negative sentinel nodes on one side.
- Bilateral lymph node assessment remains essential for accurate staging of midline vulvar cancers.