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Diffusion-weighted MRI for differentiation between sialadenitis and pleomorphic adenoma
Guilherme T C Terra1, Jefferson X D Oliveira1, Adalsa Hernandez2
11 Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Dento Maxillo Facial Radiology
|November 16, 2016
Summary
Diffusion-weighted MRI (DWI) shows higher apparent diffusion coefficient (ADC) values in parotid sialadenitis and pleomorphic adenoma compared to normal salivary glands. DWI can differentiate parotid sialadenitis from pleomorphic adenoma.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Salivary gland diseases, including sialadenitis and pleomorphic adenoma, can present with overlapping imaging features.
- Accurate differentiation is crucial for appropriate diagnosis and treatment planning.
Purpose of the Study:
- To compare apparent diffusion coefficient (ADC) values derived from diffusion-weighted MRI (DWI) in normal salivary glands, sialadenitis, and pleomorphic adenoma.
- To assess the utility of DWI in differentiating these conditions of major salivary glands.
Main Methods:
- Analysis of 44 major salivary glands from 22 patients with unilateral sialadenitis or parotid pleomorphic adenoma.
- Comparison of mean ADC values between affected glands and contralateral normal glands.
- Utilized a 1.5-T MRI device with spin-echo pulse sequence for DW image acquisition.
Main Results:
- Mean ADC values were significantly higher in parotid sialadenitis (p=0.001) but not submandibular sialadenitis (p=0.466) compared to normal glands.
- Pleomorphic adenoma cases exhibited the highest mean ADC values.
- One-way ANOVA confirmed significant differences among the three groups of parotid glands.
Conclusions:
- DWI-derived ADC values show potential for differentiating parotid sialadenitis from pleomorphic adenoma.
- This finding suggests DWI is a valuable tool in the non-invasive evaluation of major salivary gland pathologies.
