Dynamic Contrast-Enhanced Mri for Differentiation of Major Salivary Glands Neoplasms, a 3-T Mri Study Publisher Pubmed



Aghaghazvini L^{1, 2, 3} ; Salahshour F³ ; Yazdani N⁴ ; Sharifian H^{2, 3} ; Kooraki S¹ ; Pakravan M³ ; Shakiba M³
Source: Dentomaxillofacial Radiology Published:2015

Abstract

Objectives: Pre-operative differentiation of salivary gland neoplasms is of great importance. This study was designed to evaluate the use of dynamic contrast-enhanced MRI (DCE-MRI) for differentiation between malignant, Warthin and benign non-Warthin (BNW) neoplasms of major salivary glands. Methods: 46 major salivary gland tumours (SGTs) underwent pre-operative DCE-MRI. Postsurgical histopathological evaluation showed 30 BNW, 6 Warthin and 10 malignant tumours. Time-signal intensity curves (TICs) were categorized as (a) Tpeak >43 s and washout ratio at 180 s (WR180) <4.6%; (b) Tpeak <43 s and WR >22%; (c) Tpeak >43 s and WR18054.6-22.0% Results: Accuracy of Tpeak was 98.9% for differentiation between BNW and Warthin tumours, 83.7% between BNW and malignant and 80% between malignant and Warthin tumours. All Warthin tumours showed Tpeak ≤43 s, while one BNW had Tpeak <43 s. A Tpeak <63.5 s differentiated 8/10 (80%) malignant tumours from BNWtumours, whereas 4/30 of BNW tumours had a Tpeak <63.5 s. Two malignant tumours had Tpeak <43 s. WR180 had an accuracy of 100% for differentiation betweenWarthin and BNWtumours, 87.3% between BNW and malignant, and 93.3% between Warthin and malignant tumours. 29 (96.7%)BNWtumours had awashout <4.60%, while 8 (80%) malignant tumours had a washout <4.60%. All Warthin tumours had a WR180 >22%, while two malignant tumours had aWR180 >22%. 29/30 of BNW tumours demonstrated TIC curve Type A and 1 tumour demonstrated Type C. 6/10 of malignant tumours had TIC Type C, 2 had TIC Type A and 2 Type B. AllWarthin tumours were categorized as Type B. Conclusions: This study showed that DCE-MRI could be helpful in pre-operative differentiation of SGTs; especially for discrimination between Warthin and BNW tumours. © 2015 The Authors.