Abstract: Objective： To evaluate the clinical value of 3D-US in discriminate diagnosing ovarian tumor. Methods： Preoperative 2D-US and 3D-US was performed in 62 patients with suspected adnexal masses to observe the morphology of ovarian tumors and made the ultrasound diagnosis. Results：48 patients were diagnosed correctly by 2D-US, the accuracy of 2D-US diagnosing ovarian tumor is 77.4%. 14 patients were misdiagnosed, the misdiagnosis rate of 2D-US is 22.6%. 58 patients were diagnosed correctly by 3D-US, the accuracy of 3D-US is 93.5%. 4 patients were misdiagnosed, the misdiagnosis rate of 3D-US is 6.5%. Conclusions：3D-US can offer more morphology information than 2D-US, it can elevate the accuracy of discriminating ovarian tumor.

Key words: Ultrasonography, Doppler, Ultrasonography, Ovarian neoplasms, Imaging, three-dimensional