A study diagnostic value of dynamic study by contrast-enhanced MRI for parotid tumor

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  • 耳下腺腫瘍におけるdynamic studyの有用性の検討

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Abstract

We examined the usefulness of dynamic study by contrast-enhanced MRI, and the contribution of dynamic study in addition to fine needle aspiration cytology （FNAC） to the accuracy of preoperative diagnosis of parotid tumors. We retrospectively reviewed 61 patients with parotid gland surgery who underwent FNAC and contrast-enhanced MRI before surgery. In the evaluation of the dynamic study, a time-signal intensity curve （TSI curve） was calculated and evaluated. The sensitivity, specificity, and accu-racy of FNAC were 33％, 100％, 89％, respectively. On the other hand, when the A, B, and D types were evaluated as benign and the C type as malignant in the TSI curve, the sensitivity, specificity, and accuracy of the dynamic study were 58％, 98％, 90％, respectively. All of the patients who were evaluated as malignant on FNAC were type C on the TSI curve, so it is considered that adding dynamic study to FNAC increases the accuracy of preoperative diagnosis compared to FNAC alone.

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