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Superparamagnetic Iron Oxide Sentinel Node Tracer Injection: Effects on Breast MRI Quality.

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Superparamagnetic iron oxide (SPIO) tracers used for sentinel node identification cause significant MRI artifacts. These artifacts limit the diagnostic quality of postoperative breast MRI exams, impacting patient management.

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Sentinel node (SN) identification is crucial in breast-conserving surgery.
  • Superparamagnetic iron oxide (SPIO) tracers are increasingly used for intraoperative SN identification.
  • Ferromagnetic tracers can cause artifacts in magnetic resonance imaging (MRI).

Purpose of the Study:

  • To evaluate MRI artifacts from SPIO tracers used for SN identification.
  • To assess the impact of these artifacts on postoperative imaging and patient management.

Main Methods:

  • Retrospective review of MRI exams in patients who received SPIO SN tracer post-breast-conserving surgery.
  • Analysis of MRI reports and images for SPIO residue and impact on image quality.
  • Data collected from January 2015 to May 2020.

Main Results:

  • 21 MRI exams in 16 patients were analyzed.
  • All exams showed evidence of SPIO residue.
  • 5/21 exams were non-diagnostic, and the rest were limited due to SPIO artifacts.

Conclusions:

  • Radiologists must be aware of SPIO tracer use and its effect on breast MRI quality.
  • SPIO residue significantly impacts the diagnostic utility of postoperative MRIs.
  • Developing alternative injection methods and adjusting MRI sequences are necessary to mitigate artifacts.