Differentiation between Graves' disease and painless thyroiditis by diffusion-weighted imaging, thyroid iodine uptake, thyroid scintigraphy and serum parameters

Meng,Zhaowei; Zhang,Guizhi; Sun,Haoran; Tan,Jian; Yu,Chunshun; Tian,Weijun; Li,Weidong; Yang,Zhiqiang; Zhu,Mei; He,Qing; Zhang,Yujie; Han,Shugao

doi:10.3892/etm.2015.2430

Differentiation between Graves' disease and painless thyroiditis by diffusion-weighted imaging, thyroid iodine uptake, thyroid scintigraphy and serum parameters

Authors:
- Zhaowei Meng
- Guizhi Zhang
- Haoran Sun
- Jian Tan
- Chunshun Yu
- Weijun Tian
- Weidong Li
- Zhiqiang Yang
- Mei Zhu
- Qing He
- Yujie Zhang
- Shugao Han
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Affiliations: Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China, Department of Radiology, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China, Department of General Surgery, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China, Department of Endocrinology, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China, Department of Pathology, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China
Published online on: April 17, 2015 https://doi.org/10.3892/etm.2015.2430
Pages: 2165-2172

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Abstract

The aim of the present study was to assess the apparent diffusion coefficient (ADC) in diffusion-weighted imaging (DWI), thyroid radioactive iodine uptake (RAIU), thyroid scintigraphy and thyrotropin receptor antibody (TRAb) levels in the differential diagnosis between Graves' disease (GD) and painless thyroiditis (PT). A total of 102 patients with GD and 37 patients with PT were enrolled in the study. DWI was obtained with a 3.0‑T magnetic resonance scanner, and ADC values were calculated. RAIU and thyroid scintigraphy were performed. Tissue samples were obtained from patients with GD (6 cases) following thyroidectomy, and from patients with PT (2 cases) following biopsy. Receiver operating characteristic (ROC) curves were drawn, optimal cut‑off values were selected, and the sensitivity, specificity, accuracy, positive predictive value (PPV) and negative predictive value (NPV) were assessed. It was found that the ADC, TRAb and RAIU were significantly higher in GD than in PT (P<0.05). ROC curves showed areas under the curves for RAIU, ADC and TRAb that were >0.900. RAIU was the reference method. Sensitivity, specificity, accuracy, PPV and NPV were 96.078, 91.892, 95.000, 97.059 and 89.474% for ADC, and 88.235, 75.676, 84.892, 90.909 and 70.000% for TRAb, after the optimal thresholds of 1.837x10‑3 mm2/sec and 1.350 IU/ml were determined respectively. Histopathology showed that tissue cellularity in PT was much higher than in GD due to massive lymphocytic infiltration. The results of the present study indicate that RAIU, ADC and TRAb are of diagnostic value for differentiating between GD and PT. DWI has great potential for thyroid pathophysiological imaging because it reflects differences in tissue cellularity between GD and PT.

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