Related Experiment Videos
Sweat glands accumulate Tc-99m MIBI
C Jonsson1, L O Farnebo, A Fernström
1Department of Hospital Physics, Karolinska Hospital, Stockholm, Sweden.
Clinical Nuclear Medicine
|August 1, 1996
Summary
Technetium Tc-99m sestamibi (Tc-99m MIBI) scans for hyperparathyroidism can show unexpected axillary activity due to sweat glands. This finding is not linked to calcium levels and is important for interpreting scans, especially in breast cancer patients.
Area of Science:
- Nuclear medicine
- Radiopharmaceuticals
- Endocrinology
Background:
- Technetium Tc-99m sestamibi (Tc-99m MIBI) is primarily used for myocardial perfusion imaging.
- Tc-99m MIBI also shows utility in the depiction and characterization of various tumors.
- Hyperparathyroidism diagnosis often involves imaging to localize parathyroid adenomas or hyperplastic glands.
Purpose of the Study:
- To investigate the utility of Tc-99m MIBI in localizing parathyroid adenomas or hyperplasia.
- To identify and characterize unexpected findings during Tc-99m MIBI scintigraphy for hyperparathyroidism.
Main Methods:
- Tc-99m MIBI scintigraphy was performed on 41 patients with suspected hyperparathyroidism.
- Imaging focused on localizing parathyroid tissue.
- Serum calcium levels were assessed.
Main Results:
- Bilateral symmetrical axillary activity was observed in 19 out of 41 patients (46%).
- This activity corresponded to apocrine sweat glands.
- Axillary sweat gland activity showed no correlation with serum calcium levels.
Conclusions:
- Tc-99m MIBI scintigraphy can reveal physiological activity in axillary apocrine sweat glands.
- This finding is clinically relevant and must be considered to avoid misinterpretation, particularly when evaluating lymph node involvement in breast cancer patients.
- The mechanism and clinical significance of this sweat gland uptake warrant further investigation.