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Related Experiment Videos

Demonstration of large bladder diverticulum on bone scan.

Cheng-Pei Chang1, Chin-Hsien Tsai, Jyh-Hwa Chen

  • 1Department of Nuclear Medicine, Taipei Veterans General Hospital, National Defense Medical Center, and National Yang-Ming University School of Medicine, Taipei, Taiwan. cpchang@vghtpe.gov.tw

Clinical Nuclear Medicine
|March 15, 2005
PubMed
Summary

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A bone scan revealed increased tracer uptake in the pelvis, initially concerning for metastasis. However, imaging confirmed the uptake was due to retained radiotracer in a bladder diverticulum, not bone disease.

Area of Science:

  • Nuclear Medicine
  • Radiology
  • Urology

Background:

  • Postoperative follow-up is crucial after rectal cancer surgery.
  • Bone scintigraphy (Technetium-99m MDP bone scan) is used to detect bone metastases.

Observation:

  • A 74-year-old man presented with increased tracer uptake in the left hemipelvis on a bone scan after rectal cancer surgery.
  • Coronal SPECT and caudal imaging localized the uptake but did not identify a skeletal source.
  • Transverse MRI revealed a large bladder diverticulum.

Findings:

  • The increased radiotracer uptake on the bone scan was attributed to tracer retention within the bladder diverticulum.
  • This finding mimicked metastatic bone disease on initial scintigraphy.

Related Experiment Videos

Implications:

  • Bladder diverticula can cause false-positive findings on bone scintigraphy.
  • Careful correlation with cross-sectional imaging (MRI) is essential for accurate interpretation of bone scans.
  • This case highlights the importance of considering non-osseous sources of increased radiotracer uptake in the pelvis.