ObjectiveTo explore the value of contrast-enhanced ultrasound（CEUS）enhancement characteristics in the differential diagnosis of benign and malignant adrenal tumors.MethodsA total of 50 patients with adrenal tumor confirmed by pathology（29 cases were benign

21 cases were malignant）were selected

and all underwent conventional ultrasound and CEUS.The enhancement characteristics of the tumors

including enhancement phase

enhancement sequence

enhancement mode and enhancement degree were observed and recorded

and the differences were compared. The receiver operating characteristic（ROC）curve was drawn

and the efficacy of CEUS enhancement characteristics in the diagnosis of benign and malignant adrenal tumors was calculated.Results The position

size and internal echo of benign and malignant adrenal tumors were statistically different（all P<0.05）

but no significant differences were found in boundary

shape and blood flow distribution.CEUS indicated that most of the malignant adrenal neoplasms showed fast progression

centripetal

regional

isointensity or high enhancement.Benign tumors were mostly slow-progressive

uncharacteristic

holistic

and low-enhancement

and the differences in enhancement characteristics of benign and malignant adrenal tumors were statistically significant（all P<0.05）. ROC curve analysis showed that the enhanced mode had the highest diagnostic efficiency

the area under the curve was 0.87

the sensitivity was 85.71%

and the specificity was 89.66%.ConclusionCEUS can provide acertain diagnostic basis for differentiating benign and malignantadrenaltumors

which has important clinical value.