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Suture Granuloma Showing False-Positive Findings on FDG-PET

Kohei Takahara1, Hiroaki Kakinoki, Saya Ikoma

  • 1Department of Urology, Faculty of Medicine, Saga University, Nabeshima 5-1-1, Saga 849-8501, Japan.

Case Reports in Urology
|June 14, 2013
PubMed

Insights

FDG-PET scans can show false positives due to suture granulomas after testicular tumor surgery. Avoiding silk sutures may prevent unnecessary procedures and improve diagnostic accuracy for patients.

Area of Science:

  • Oncology
  • Nuclear Medicine
  • Surgical Pathology

Background:

  • Mixed germ-cell testicular tumors require careful postoperative monitoring.
  • Fluorodeoxyglucose-Positron Emission Tomography (FDG-PET) is a common imaging modality for detecting cancer recurrence.
  • Suture materials can elicit inflammatory responses, potentially mimicking disease on imaging.

Purpose of the Study:

  • To report a case of suture granuloma causing a false-positive FDG-PET finding after testicular tumor surgery.
  • To review the literature on suture granulomas and their impact on FDG-PET interpretation.
  • To highlight the importance of considering suture reactivity in postoperative imaging.

Main Methods:

  • Case presentation of a 33-year-old male with mixed germ-cell testicular tumor.
  • Postoperative FDG-PET imaging.
  • Review of existing literature on suture granulomas and FDG-PET findings.

Main Results:

  • FDG-PET revealed increased FDG uptake in the left inguinal area.
  • This uptake was identified as a suture reactivity granuloma, not metastasis or local recurrence.
  • Literature review confirmed suture granulomas as a cause of false-positive FDG-PET results.

Conclusions:

  • Suture granulomas can lead to false-positive findings on postoperative FDG-PET scans.
  • The use of silk thread may contribute to suture reactivity granulomas.
  • Avoiding silk sutures could prevent unnecessary interventions in patients monitored with FDG-PET.

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