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Pre-operative localization and tissue uptake study in parathyroid imaging with technetium-99m-sestamibi
H Takami1, M Oshima, I Sugawara
1First Department of Surgery, Teikyo University School of Medicine, Itabashi, Tokyo, Japan. takami@med.teikyo-u.ac.jp
Background:
The diagnostic ability of 99mTc-sestamibi was compared with other techniques and the mechanism of parathyroid uptake was investigated.
Methods:
Double-phase 99mTc-sestamibi scanning was performed in 52 primary and 28 renal hyperparathyroidism patients. Gene expressions of mdr1 and mrp were examined by reverse transcriptase polymerase chain reaction in parathyroid tissue.
Results:
The sensitivity of 99Tc-sestamibi in primary and renal hyperparathyroidism was 91% and 75%, respectively, higher than for ultrasonography, T1/Tc subtraction scintigraphy, or computed tomography. Early 99mTc-sestamibi uptake was washed out in delayed images in 7% and 30% of glands in primary and renal hyperparathyroidism, respectively. Expression of mdr1 and mrp mRNA was found in 5 of 23 and 16 of 31 glands, respectively, and their expression correlated with washout in delayed images.
Conclusion:
99mTc-sestamibi was the best localization test. mdr1 and mrp were associated with 99Tc-sestamibi washout, but their role in the parathyroid remains unclear.