Abstract
Objectives
To identify frequent MRI features of parathyroid adenomas (PTAs) in patients with primary hyperparathyroidism (PHPT) using a fast protocol with a 3 T magnet.
Methods
Thirty-eight patients with PHPT underwent a 3 T-MR. All patients had positive US and Tc-99 sestamibi, for a total number of 46 PTAs. T2-weighted IDEAL-FSE and T1 IDEAL-sequences, before and after contrast, were performed. Five features of PTAs were recognised: hyperintensity, homogeneous or "marbled" appearance and elongated morphology on T2-sequences; cleavage plane from thyroid gland on T2-outphase; rapid enhancement in post-contrast T1. Image quality for T2-weighted IDEAL FSE and usefulness for IDEAL post-contrast T1-weighted and T2-outphase sequences were also graded.
Results
PTAs were hyperintense in T2-sequences in 44/46 (95.7 %), "marbled" in 30/46 (65.2 %) and elongated in 38/46 (82.6 %) patients. Cleavage plane was observed in 36/46 (78.3 %), and rapid enhancement in 20/46 (43.5 %) patients. T2-sequences showed both excellent fat suppression and image quality (average scores of 3.2 and 3.1). T2-outphase images demonstrated to be quite useful (score 2.8), whereas, post-contrast T1 images showed a lower degree of utility (score 2.4).
Conclusions
A fast protocol with 3.0-T MRI, recognising most common features of PTAs, may be used as a second-line method in the preoperative detection of PTAs.
Key Points
• 3 T MRI protocol based on T2-weighted IDEAL FSE sequences was used.
• T2-hyperintensity and elongated morphology are common features of PTAs.
• 3 T MRI could be used in the preoperative detection of PTAs.
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Acknowledgments
The scientific guarantor of this publication is prof. Carlo Catalano. The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Methodology: prospective, observational study, performed at one institution.
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Sacconi, B., Argirò, R., Diacinti, D. et al. MR appearance of parathyroid adenomas at 3 T in patients with primary hyperparathyroidism: what radiologists need to know for pre-operative localization. Eur Radiol 26, 664–673 (2016). https://doi.org/10.1007/s00330-015-3854-5
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DOI: https://doi.org/10.1007/s00330-015-3854-5