Diffusion-weighted MRI in the differential diagnosis of parotid malignancies and pleomorphic adenomas: can the accuracy of dynamic MRI be enhanced?

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Bogusław MikaszewskiCzesław Stankiewicz

Abstract

(1) To verify whether appropriate selection of cutoff values for dynamic and diffusion-weighted magnetic resonance imaging (MRI) parameters optimizes the accuracy of preoperative differential diagnosis of parotid malignancies and pleomorphic adenomas. (2) To define the role of preoperative MRI in the differential diagnosis of parotid tumors. The retrospective analysis included 221 surgical patients with parotid tumors. Aside from ultrasonography-guided fine-needle biopsy, the preoperative protocol included dynamic and diffusion-weighted MRI. Final diagnoses were based on histopathologic examination of surgical specimens. Receiver operating characteristic analysis was conducted to determine the sensitivity and specificity of preoperative MRI with various combinations of cutoff values. Twenty-four patients with parotid malignancies (10.8%) and 57 with pleomorphic adenomas (25.8%) were identified. Parotid malignancies had significantly lower values of apparent diffusion coefficient and Tpeak, as well as significantly higher values of Tmax and washout rate. An apparent diffusion coefficient ≤1.267 × 103 mm/s2 yielded optimum accuracy in identification of parotid malignancies (95.8% sensitivity and 93% specificity). Diffusion-weight...Continue Reading

Citations

Aug 19, 2020·European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·Dmitry Tretiakow, Andrzej Skorek
Sep 19, 2020·Diagnostic and Interventional Imaging·H CoudertP-F Montoriol
Jun 8, 2021·Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology·Hirotaka MuraokaTakashi Kaneda

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