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Adding ultrasound (US) to four-dimensional CT (4D-CT) for parathyroid adenoma localization did not significantly improve accuracy but did increase radiologist confidence. This combination is beneficial for inferior glands and larger lesions.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Endocrinology

Background:

  • Four-dimensional CT (4D-CT) is crucial for preoperative parathyroid adenoma localization in primary hyperparathyroidism.
  • Ultrasound (US) is often added to 4D-CT, assuming it enhances diagnostic performance.

Purpose of the Study:

  • To determine if incorporating US into 4D-CT improves diagnostic accuracy for parathyroid adenomas.
  • To assess the impact of combined US and 4D-CT on radiologists' diagnostic confidence.

Main Methods:

  • Retrospective review of 80 primary hyperparathyroidism patients who underwent both 4D-CT and US before parathyroidectomy.
  • Radiologists reviewed cases twice: 4D-CT alone and 4D-CT + US, assessing lesion location and confidence (5-point Likert scale).
  • Localization accuracy compared against operative and pathology results; performance analyzed per-patient and per-lesion with subgroup analyses.

Main Results:

  • Sensitivity modestly increased with US addition (88.3% to 91.5%) but not significantly; overall accuracy remained high.
  • Radiologist confidence was significantly higher with combined 4D-CT + US.
  • While high-confidence true positives increased, high-confidence false positives also rose, reducing PPV in certain subgroups, especially with smaller lesions or goiter.

Conclusions:

  • Adding US to 4D-CT did not significantly enhance parathyroid adenoma localization accuracy.
  • The combined approach substantially increased radiologist confidence in lesion localization.
  • US addition offered greatest benefit for inferior glands and larger lesions, but challenges arose in technically difficult cases.