Aims: To evaluate the effectiveness of diffusion weighted imaging and dynamic contrast enhanced magnetic resonance imaging in qualitative diagnosis of complex ovarian tumors．
Methods: Semi-quantitative parameters of maximal slope of time-signal intensity curve and apparent diffusion coefficient measurements of diffusion-weighted imaging obtained from the tumor solid regions in 65 cases confirmed complex ovarian tumors were done．
Results: A cut-off value of 1．61 × 10－3mm2 /s for ADC was used in differentiating invasive from borderline tumors．Optimal threshold value for maximal slope was 4．58% per second identifying benign and malignant tumors.
Conclusion: Maximal slope value of time-signal intensity curve is the best index in distinguishing malignant from benign ovarian complex tumors，and ADC value of the solid component is the best index in differentiating invasive from borderline ovarian complex tumors．
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