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(99m)Tc-MIBI Uptake in a Thyroid Adenoma with Diffuse Adipose Metaplasia
Paone, Gaetano,Mazzucchelli, Luca,Peloni, Giuseppe,Fasolini, Fabrizio,Giovanella, Luca The Korea Society of Nuclear Medicine 2016 핵의학 분자영상 Vol.50 No.4
A 71-year-old female underwent a (99m)Tc-MIBI scan to characterize a cold nodule (30 mm) of the left thyroid lobe. The nodule showed diffuse uptake and retention of the radiotracer. After resection, histological examination demonstrated a microfollicular adenoma with diffuse white adipose metaplasia. Although mitochondria in brown adipose tissue have been widely studied, we have only a limited understanding of the relevance of mitochondria in white adipose tissue. Active mitochondria are present in white adipocytes, and this may account for the MIBI uptake, mimicking a hyperproliferation pattern, in our patient.
Luca Giovanella,Gaetano Paone,Teresa Ruberto,Luca Ceriani,Pierpaolo Trimboli 대한내분비학회 2019 Endocrinology and metabolism Vol.34 No.1
Background: Postoperative routine radioiodine (RAI) treatment is currently debated for patients with low-risk differentiated thyroidcarcinoma (DTC) patients. If performed, a low 131I activity (i.e., 1 to 2 GBq) is recommended with the aim to ablate thyroid remnantand facilitate subsequent follow-up by thyroglobulin measurement. The purpose of this study was to evaluate the relationship between postsurgical technetium-99m (99mTc)-pertechnetate scintigraphy and the rate of successful remnant ablation after low activityradioiodine ablation in patients with DTC. Methods: Enrolled were 193 patients with low risk DTC who underwent total thyroidectomy and RAI ablation with a fixed 1.1 GBqactivity of 131I. 99mTc-pertechnetate scans were done and thyrotropin stimulated thyroglobulin (sTg) levels measured just before ablation. Ablation effectiveness was assessed 6 to 12 months later by sTg measurement, neck ultrasound and diagnostic whole body scan. Results: A negative 99mTc-perthecnetate scans was the best predictor of successful ablation (P<0.001) followed by preablative sTglevels <0.8 ng/mL (P=0.008) and 99mTc-pertechnetate uptake rate values <0.9% (P=0.065). Neither sex nor age of the patient at thetime of ablation or tumor histology and size showed a significant association with the rate of successful ablation. Conclusion: The 99mTc-pertechnetate scintigraphy is a simple and feasible tool to predict effectiveness of low activity 131I thyroid toablate thyroid remnants in patients with DTC.