The sestamibi scan as a preoperative screening tool.

Area of Science:

• Endocrinology
• Nuclear Medicine
• Surgical Oncology

Background:

• Parathyroid adenoma diagnosis often relies on imaging, with sestamibi scans widely used.
• Preoperative localization via sestamibi scans may improve surgical outcomes, reducing invasiveness and recovery time.
• The predictive value of sestamibi scans and correlation with biochemical markers require further investigation.

Purpose of the Study:

• To determine the sensitivity of sestamibi scans in detecting parathyroid adenomas.
• To assess if parathyroid hormone (PTH) or calcium levels independently predict a positive sestamibi scan.
• To evaluate the impact of adenoma size on sestamibi scan sensitivity.

Main Methods:

• Retrospective review of 100 patients undergoing preoperative sestamibi scans for parathyroid adenoma.
• Dual-phase sestamibi scan technique with tracer washout from the thyroid.
• Correlation analysis between scan results, adenoma weight, PTH levels, and calcium levels.

Main Results:

• Overall sestamibi scan sensitivity was 87% for parathyroid adenomas.
• Sensitivity increased to 91% for adenomas weighing over 500 mg, and was 80% for those under 500 mg.
• Calcium levels correlated with adenoma weight and PTH levels, but neither biochemical marker predicted a positive sestamibi scan.

Conclusions:

• Sestamibi scans are highly sensitive for detecting parathyroid adenomas, particularly larger ones.
• Adenoma size significantly influences sestamibi scan sensitivity.
• Biochemical markers (calcium, PTH) do not predict sestamibi scan positivity, highlighting the scan's independent diagnostic value.