What is the radiocolloid intratumoral injection technique for breast cancer lymphoscintigraphy (sentinel lymph node mapping)?

Updated: Dec 13, 2018
  • Author: Durre Sabih, MBBS, MSc, FRCP(Edin); Chief Editor: Mahan Mathur, MD  more...
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Although some authors have advocated injection inside the tumor, there are concerns about tumor spread, especially along the needle track. Proponents claim 100% reproducibility and sentinel node visualization. [21] A small volume of radiopharmaceutical (0.2 mL), with 0.1 mL of air bubble behind it, is injected into the center of the tumor.

If the mass is nonpalpable, ultrasound guidance can be used for needle placement.

The patient is asked to massage over the injection site and between the injection site and axilla for at least 1-2 minutes.

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