A comparison of conventional and diffusion-weighted magnetic resonance imaging in the diagnosis of sialadenitis and pleomorphic adenoma

Publication date: Available online 18 October 2018

Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

Author(s): Juliane P Araujo, Guilherme TC Terra, Arthur RG Cortes, Adalsa Hernandez, Jefferson X Oliveira

ABSTRACT

Objectives: To compare the efficacy of conventional magnetic resonance imaging (MRI) and diffusion-weighted imaging (DWI) in helping observers correctly identify the presence of disease in the major salivary glands and correctly distinguish sialadenitis from pleomorphic adenoma.

Study design: Twenty-one patients diagnosed with unilateral sialadenitis or pleomorphic adenoma were selected. The non-affected contralateral glands were also analyzed. T1- and T2-weighted MRI and DWI were obtained using spin-echo (SE) pulse sequences with a 1.5 Tesla MRI device. The diagnostic performance of three observers was evaluated for detection of salivary gland alterations and differentiation between sialadenitis and pleomorphic adenoma based on evaluation of MRI compared to DWI.

Results: Intra-and interobserver reliability ranged from 0.86 to 0.94. DWI resulted in greater sensitivity and accuracy values than MRI for both detection of disease and differentiation of sialadenitis from pleomorphic adenoma, with specificity values that were greater than or equal to MRI. DWI yielded significantly higher diagnostic odds ratios than MRI for both identification of disease and for differentiation between lesions.

Conclusion: DWI resulted in better diagnostic performance for detection of alterations in the salivary glands and for the differentiation between sialadenitis and pleomorphic adenoma compared to conventional T1 and T2-weighted MRI.

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