目的探讨MR扩散加权成像(DWI) 在卵巢囊腺癌与囊腺瘤鉴别诊断中的价 值。方法 回顾性分析经临床手术及病理 证实的28例卵巢囊腺癌及30例卵巢囊腺瘤 患者MR图像，记录两者囊壁或间隔DWI信 号高低并测量其ADC值(b=800s/mm2 )，并 进行统计学分析。结果 28例卵巢囊腺癌 表现为囊实性肿物，囊壁及间隔不规则增 厚，壁结节或实性成分DWI均表现为高信 号(100%)，平均ADC值(0.95±0.18)×10- 3 mm2 /s。30例囊腺瘤为单房或多房肿物， 边缘光滑，囊壁及间隔厚度均匀或不均 匀，28例高b值扩散加权成像信号不高 (93.3%)，平均ADC值(1.72±0.28)×10- 3 mm2 /s。DWI诊断囊腺癌敏感性高(100%)， 特异性高(93.3%)。囊腺癌与囊腺瘤DWI信 号高低、ADC值之间比较差异有统计学意 义(P<0.05)。结论 DWI在囊腺癌与囊腺瘤 鉴别诊断中有重要作用，通过对病变ADC 值进行定量分析，能为卵巢囊腺癌及囊腺 瘤定性诊断提供一定的依据。

Objective To evaluate the value of diffusion weighted imaging in diagnosis of ovarian cystadenocarcinoma. Methods 28 patients with pathologically-proved cystadenocarcinama and 30 patients were cystadenoma based on MR imaging were retrospectively analyzed, record the DWI signal of the cystic wall or interval and measuring its ADC value (b=800s/mm2 ) and nonparametric test was used. Results The MR findings of cystadenocarcinoma were complex solid and cystic ovarian tumors with thick,irregular wall with thick sepa,mural nodule,and soft tissue component,which showed hyperintensity on DWI,and the mean ADC values was (0.95±0.18)×10- 3 mm2 /s. The cystadenoma findings were thin and smooth wall with uniocular or multicular,lacks of the mural nodule, which showed hypointensity on DWI,and the mean ADC values was (1.72±0.28)×10-3mm2 /s.In diagnosis of cystadenocarcinoma on DWI provided sensitivity 100% and specificity 93.3%,the DWI signal and the ADC value in comparison wih cystadenocarcinoma and cystadenoma have statistical differences(P<0.05). Conclusion DWI sequence play an important role in diagnosis of cystadenocarcinoma and cystadenoma,by analysis of the ADC values we found that the ADC values can provide qualitation value,and have differential value in diagnosis of cystadenocarcinoma and cystadenoma.