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Identification of Warthin tumor: magnetic resonance imaging versus salivary scintigraphy with technetium-99m
Ken Motoori1, Takuya Ueda, Yoshitaka Uchida
1Department of Radiology, Chiba University Hospital, Chiba City, Chiba, Japan. motoorik@faculty.chiba-u.jp
Objective:
The aim of this study was to evaluate the accuracy of technetium-99m (Tc-99m) pertechnetate scintigraphy and magnetic resonance (MR) imaging in the diagnosis of Warthin tumor.
Methods:
Sixteen cases of Warthin tumor and 17 cases of non-Warthin tumor were examined by Tc-99m pertechnetate scintigraphy with lemon juice stimulation and MR imaging, including T1-weighted, T2-weighted, short inversion time inversion recovery, diffusion-weighted, and contrast-enhanced dynamic images. We used the receiver operating characteristic (ROC) curve to evaluate diagnostic accuracy.
Results:
The mean area under the ROC curves of MR imaging in the diagnosis of Warthin tumor (0.97) was higher than that of Tc-99m pertechnetate scintigraphy (0.88).
Conclusion:
Magnetic resonance imaging is more useful in the evaluation of Warthin tumor than Tc-99m pertechnetate scintigraphy.
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