Abstract
Objectives
To determine added value of permeability MRI in parotid tumor characterization to T2-weighted imaging (T2WI), semi-quantitative analysis of time-intensity curve (TIC), and intra-voxel incoherent motion diffusion-weighted imaging (IVIM-DWI).
Methods
This retrospective study was approved by the institutional review board, and the informed consent was waived. Sixty-one parotid tumors in 61 patients were examined using T2WI, IVIM-DWI, and permeability MRI. TIC patterns were categorized as persistent, washout, or plateau. Signal intensity ratio of lesion-to-muscle on T2WI, apparent diffusion coefficients (ADCs), D and f values from IVIM-DWI, and Ktrans, kep, Ve, and Vp values from permeability MRI were measured. Multiple comparisons were applied to determine whether any differences among 4 histopathologic types (pleomorphic adenomas, Warthin’s tumors, other benign tumors, and malignant tumors) existed. Diagnostic accuracy was compared before and after modification diagnosis referring to permeability MRI. In a validation study, 60 parotid tumors in 60 patients were examined.
Results
ADC and D values of malignant tumors were significantly lower than those of benign tumors other than Warthin’s tumors, but higher than those of Warthin’s tumors. kep and Vp values of Warthin’s tumors were significantly higher than those of malignant tumors. Multivariate analyses showed that TIC pattern, D, and kep values were suitable parameters. McNemar’s test showed a significant increase of sensitivity (11/12, 92%) and specificity (46/49, 94%) with adding kep. The validation study yielded high sensitivity (14/16, 88%) and specificity (41/44, 93%).
Conclusion
Permeability MRI offers added value to IVIM-MRI and semi-quantitative TIC analysis of DCE-MRI in characterization of parotid tumors
Key Points
• Permeability MR imaging offers added value in the characterization of parotid gland tumors in combination with semi-quantitative TIC analysis and IVIM analyses with D parameter.
• The combination of TIC pattern, D, and k ep might facilitate accurate characterization of parotid gland tumor, thereby avoiding unnecessary surgery for benign tumors or delayed treatment for malignant tumors.
• A combination of permeability and diffusion MR imaging can be used to guide the selection of an appropriate biopsy site.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AIF:
-
Arterial input function
- ASL:
-
Arterial spin labeling
- D :
-
True diffusion coefficient
- DWI:
-
Diffusion-weighted imaging
- FFE:
-
Fast field echo
- FNA:
-
Fine-needle aspiration
- IVIM:
-
Intra-voxel incoherent motion
- k ep :
-
Rate constant from extracellular extravascular space to plasma
- K trans :
-
Rate constant from plasma to extracellular extravascular space
- MRI:
-
Magnetic resonance imaging
- ROI:
-
Region of interest
- SI:
-
Signal intensity
- T2WI:
-
T2-weighted imaging
- TIC:
-
Time-intensity curve
- V e :
-
Extracellular extravascular volume fraction
- V p :
-
Plasma fraction
- WR:
-
Washout ratio
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Yabuuchi, H., Kamitani, T., Sagiyama, K. et al. Characterization of parotid gland tumors: added value of permeability MR imaging to DWI and DCE-MRI. Eur Radiol 30, 6402–6412 (2020). https://doi.org/10.1007/s00330-020-07004-3
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DOI: https://doi.org/10.1007/s00330-020-07004-3