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Related Experiment Videos

Penile lymphoscintigraphy for sentinel node identification.

R A Valdés Olmos1, P J Tanis, C A Hoefnagel

  • 1Department of Nuclear Medicine, The Netherlands Cancer Institute, Amsterdam.

European Journal of Nuclear Medicine
|June 1, 2001
PubMed
Summary
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Lymphoscintigraphy effectively identifies sentinel nodes (SNs) in penile cancer patients, aiding accurate staging. This method helps avoid unnecessary lymph node dissection for most patients.

Area of Science:

  • Oncology
  • Nuclear Medicine
  • Surgical Oncology

Background:

  • Sentinel node (SN) identification via lymphoscintigraphy is established for breast cancer and melanoma.
  • Penile carcinoma staging and treatment decisions rely heavily on accurate lymph node assessment.

Purpose of the Study:

  • To evaluate the efficacy and findings of lymphoscintigraphy for sentinel node identification in penile carcinoma.
  • To assess the feasibility and accuracy of this technique in a cohort of penile cancer patients.

Main Methods:

  • Lymphoscintigraphy using technetium-99m nanocolloid was performed in 74 clinically lymph node-negative penile cancer patients (stage T2+).
  • Injections were intradermal around the tumor, followed by dynamic and static imaging. SN location was marked for gamma probe-guided biopsy.

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  • A total of 173 SNs were visualized, with a visualization rate of 97%.

    • Main Results:

    • Bilateral lymphatic drainage was observed in 81% of cases, with synchronous drainage in 38% and asynchronous in 62%.
    • SN visualization occurred early, with 93% visualized before 30 minutes.
    • Tumor-positive SNs were found in 22% of patients, leading to subsequent lymph node dissection. Two patients with negative SNs developed metastases later.

    Conclusions:

    • Penile lymphoscintigraphy is a valid, well-tolerated method for lymphatic mapping and SN identification in penile cancer.
    • Late imaging is recommended for patients with initial unilateral drainage to detect contralateral filling.
    • SN identification improves staging accuracy and can help avoid extensive lymph node dissection.