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Diagnostic value of diffusion weighted imaging and conventional magnetic resonance imaging on parotid gland tumors
LIU Yuanzao  SHI Tianliang  QIN Zhihong  LUO Yingbin  YANG Changfu 

Cite this article as: LIU Y Z, SHI T L, QIN Z H, et al. Diagnostic value of diffusion weighted imaging and conventional magnetic resonance imaging on parotid gland tumors[J]. Chin J Magn Reson Imaging, 2023, 14(11): 142-146, 163. DOI:10.12015/issn.1674-8034.2023.11.023.


[Abstract] Objective To investigate the value of diffusion weighted imaging (DWI), conventional MRI (cMRI) finding and demographic data to diagnose parotid gland tumors.Materials and Methods A retrospective evaluation was made of the clinical data, histopathologic data, preoperative cMRI and DWI of 85 patients who underwent parotidectomy from November 2015 to September 2021 in Tongren People's Hospital. They were classified into three categories according to pathology: pleomorphic adenoma (PA), Warthin's tumor (WT) and malignant tumor (MT). Values of apparent diffusion coefficient (ADC) for PA, WT and MT were compared. The signal of lesion was observed on cMRI sequence. Classification variables were tested using Pearson's chi-squared test. For metric parameters, normality tests were performed first. If they follow a normal distribution, t-tests erre used, else non-parametric tests will be used.Results A total of 35 cases were PA, 31 cases were WT and the remaining 19 cases were MT. the PA group was younger and more frequent in females than the WT and MT groups, while WT and MT were more frequent in males. The PA group was younger and more frequent in females than the WT and MT groups, whereas it was more frequent in WT and MT in males. The cMRI was able to clearly visualize anatomical structures. The median of ADC values for them were (1.53±0.29) ×10-3 mm2/s, (0.77±0.20) ×10-3 mm2/s and (1.06±0.19) ×10-3 mm2/s, respectively. PA was differentiated from the other two groups (P＜0.001). When the ADC threshold was 1.23×10-3 mm2/s, the sensitivity and specificity for differentiating PA from WT was 94.3% and 93.5%, respectively; and when the ADC threshold was 1.29×10-3 mm2/s for identifying PA from MT was 85.7% and 84.2%, respectively.Conclusions cMRI can provide anatomical and adjacent structural information for parotid gland tumors, and the ADC value can characterize the histopathological features of the tissue. The combination of the two is helpful for distinguishing between PA, WT, and MT, and is an important auxiliary tool for preoperative evaluation of parotid gland tumors.
[Keywords] magnetic resonance imaging；diffusion weighted imaging；apparent diffusion coefficient；parotid Gland；pleomorphic adenoma；Warthin's tumor；malignant tumor

LIU Yuanzao   SHI Tianliang*   QIN Zhihong   LUO Yingbin   YANG Changfu  

Department of Radiology, Tongren People's Hospital, Tongren 554300, China

Corresponding author: SHI T L, E-mail: 573331389@qq.com

Conflicts of interest   None.

ACKNOWLEDGMENTS Science and Technology Foundation of Guizhou Provincial Health Commission (No. gzwjkj2020-1-178).
Received  2021-11-16
Accepted  2023-10-27
DOI: 10.12015/issn.1674-8034.2023.11.023
Cite this article as: LIU Y Z, SHI T L, QIN Z H, et al. Diagnostic value of diffusion weighted imaging and conventional magnetic resonance imaging on parotid gland tumors[J]. Chin J Magn Reson Imaging, 2023, 14(11): 142-146, 163. DOI:10.12015/issn.1674-8034.2023.11.023.

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