Diagnostic value of DWI combined with dynamic contrast-enhanced MR imaging of salivary gland tumor on 3.0T MR

ZHENG Ning; WANG Guangbin; QI Xianlong; XIN Shunbao; LIU Wenjuan; SHAO Shuo; LI Rui

Abstract：Objective To evaluate the diagnostic value of DWI combined with dynamic contrast-enhanced MR imaging of sali-vary gland tumor on 3.0T MR.Methods Thirty-seven cases of salivary gland tumors were all confirmed by biopsy or surgical pa-thology.Clinical materials as well as MRI were analyzed retrospectively.Emphasis was placed on the lesion morphology, borders, capsule signal intensity characteristics, ADC values and TIC types.Results The ADC values of pleomorphic adenomas (1.75 ± 0.32 ×10-3 mm2/s) , adenolymphoma (0.78 ±0.09 ×10-3 mm2/s) and malignant tumors (1.12 ±0.21 ×10-3 mm2/s) were sig-nificantly significant.The ADC values between benign and malignant tumors of the salivary gland were not significanly different. The ADC value threshold between adenolymphoma and malignancies was 0.83 ×10-3 mm2/s, and pleomorphic adenomas and car-cinomas was 1.38 ×10-3 mm2/s;Eleven cases’ TIC were type A, 15 cases were type B, 10 cases were type C, lymphangioma was type D.There were significant differences between the Tpeak values of gland lymphoma (22.7 ±11.7) s and malignancy (43.2 ±14.1) s ( P <0.01).Adenolymphoma washout rate (58.5%±7.4) was higher than malignant tumors (18.2%± 12.1) ( P <0.01).Taking the TIC type A, B and D as benign, the type C as malignant, the sensitivity, specificity, accuracy, positive predictive value and negative predictive values were 88.9%, 80%, 86.5%, 92.3%, 72.7%, and Taking TIC type B and C combined with ADC value, the values were 92.5%, 90%, 91.9%, 96.2%, 81.8%.Conclusion ADC value and TIC types were useful in the diagnosis of salivary gland tumors.The combination of ADC values and TIC curve would improve the qual-itative diagnosis when the TIC type was B or C.