Objective To assess the value of the MRI-based ovarian-adnexal reporting and data system (O-RADS MRI) for the diagnosis of adnexal masses. Methods A total of 407 patients who underwent dynamic contrast enhancement (DCE)-MRI and pathological examination (gold standard) at the Department of Radiology,Central Hospital of Wuhan between May 2017 and December 2022 were enrolled in this study.Two radiologists performed the O-RADS MRI scoring of adnexal masses according to MRI features and calculated the malignancy rate of adnexal masses by O-RADS MRI score,enhancement type,and mass type.Moreover,receiver operating characteristic curves were established to further evaluate the diagnostic values of O-RADS MRI score,enhancement type,and mass type for adnexal masses. Results A total of 502 adnexal masses were identified in the 407 patients enrolled in this study,including 364 benign masses and 138 malignant masses (including junctional masses).Radiologist 1 reported the malignancy rates of 0,0,5.4%,80.0%,and 89.7% and radiologist 2 reported the malignancy rates of 0,0,5.8%,86.2%,and 83.0% for the adnexal masses with the O-RADS MRI scores of 1-5,respectively.With O-RADS MRI ≥4 indicating malignant masses,the sensitivity,specificity,accuracy,positive predictive value,negative predictive value,false negative rate,and false positive rate were 94.2%,93.6%,93.8%,84.9%,97.7%,2.3%,and 15.1% for radiologist 1 and 93.4%,93.6%,93.6%,85.4%,97.4%,3.6%,and 14.6% for radiologist 2,respectively.The malignancy rates of the adnexal masses presenting no enhancement,cystic wall enhancement,type Ⅰ curve,type Ⅱ curve,and type Ⅲ curve were 0,1.3%,5.7%,81.2%,and 89.0% as reported by radiologist 1 and 0,1.2%,11.3%,87.6%,and 80.0% as reported by radiologist 2,respectively.The malignancy rates of the adnexal masses that were cystic lesions,cystic segregated lesions,solid lesions,cystic solid lesions,and cystic solid segregated lesions were 0,7.1%,38.7%,79.1%,and 89.8% as reported by radiologist 1 and 0,8.1%,37.8%,72.4%,and 89.6% as reported by radiologist 2,respectively.With type Ⅱ and type Ⅲ curves as the criteria for malignancy,the sensitivity of radiologists 1 and 2 was lower for cystic segregated lesions,both at 50.0%.For the masses containing solid components,radiologists 1 and 2 demonstrated low specificity,which was 57.7% and 56.5%,respectively.False-positive masses contained solid components and were mostly fibroadenomas or adnexal leiomyomas,while false-negative masses were mostly junctional cystadenomas with no or few solid components. Conclusions The O-RADS MRI risk stratification has a high diagnostic value for adnexal masses.Further evaluation and refinement are needed to reduce the false-positive rate.
目的 评估基于MRI的卵巢-附件报告和数据系统(O-RADS MRI)对附件肿块的诊断价值。方法 回顾性收集2017年5月至2022年12月在武汉中心医院影像科行盆腔磁共振平扫、动态增强并病理证实的患者407例;两名影像科医师通过磁共振图像特征对每个附件病变进行O-RADS MRI评分并以病理为金标准计算各个评分、增强类型、病变性质的恶性率,采用受试者工作特征曲线分析O-RADS MRI 评分、增强类型、病变性质对附件肿块的诊断价值。结果 407例患者共502个病变,其中良性病变364个,恶性病变(包括交界性肿瘤)138个。两名影像科医师O-RADS MRI 评分(1~5分)的恶性率:医师1分别 为0、0、5.4%、80.0%、89.7%,医师2分别为0、0、5.8%、86.2%,83.0%。以O-RADS MRI≥4分为最佳截断值,计算敏感度、特异度、准确度及阳性预测值、阴性预测值、假阴性率、假阳性率:医师1分别为94.2%、93.6%、93.8%、84.9%、97.7%、2.3%、15.1%,医师2分别为93.4%、93.6%、93.6%、85.4%、97.4%、3.6%、14.6%。增强类型(无强化、囊壁强化、I型曲线、Ⅱ型曲线、Ⅲ型曲线)的恶性率:医师1分别为0、1.3%、5.7%、81.2%、89.0%,医师2分别为0、1.2%、11.3%、87.6%、80.0%。囊性、囊性伴分隔病变、实性病变、囊实性病变及囊实性伴分隔病变的恶性率:医师1分别为0、7.1%、38.7%、79.1%、89.8%,医师2分别为0、8.1%,37.8%、72.4%、89.6%。以Ⅱ型、Ⅲ型曲线作为恶性标准,在囊性伴分隔病变中,医师1及医师2的灵敏度较低,均为50.0%。在含实性成分病变中,医师1与医师2的特异度均较低,分别为57.7%、56.5%。假阳性病变均含实性成分,多为纤维瘤、附件区肌瘤;假阴性病变多为交界性囊腺瘤,无实性成分或实性成分较少。结论 O-RADS MRI风险分层系统在附件肿块良恶性诊断中具有较高的诊断价值,但仍需要进一步评估和完善,以降低假阳性率。.
Keywords: MRI; adnexal mass; diagnostic value; ovarian-adnexal reporting and data system.