磁共振扩散加权成像对不可触及隐睾诊断价值

The value of combined DWI and routine MRI in evaluating non-palpable testis

目的:评价DWI序列是否可增加不可触及隐睾的检出率。方法:回顾性分析36例经病理证实的隐睾患者影像临床资料,其中单侧隐睾34例,双侧隐睾2例。所有患者术前均行常规(T1WI、T2WI)及DWI检查,采用双盲法评估并计算MR常规序列、DWI及常规序列+DWI对于不可触及隐睾诊断的敏感性、特异性、准确性、阳性预测值及阴性预测值。结果:隐睾表现为边缘清晰的椭圆形长T1、长T2信号,DWI上呈高信号。联合应用T1WI、T2WI及DWI的敏感性、准确性分别为90.9%与91.7%,均高于单独应用T1WI、T2WI或DWI(P<0.05)。结论:联合应用T1WI、T2WI与DWI序列有助于提高不可触及隐睾的准确定位和诊断。

Objective：To evaluate the effect of combined diffusion-weighted imaging and routine MR imaging in evaluating non-palpable testis. Methods： 36 patients with non-palpable testis underwent routine MRI diffusion-weighted imaging （DWI）. The sensitivity, specificity, accuracy, positive prospective value and negative prospective value of DWI, routine MRI, and the combination of DWI and routine MRI in evaluating non-palpable testis were calculated. Results： The testis was long T1 and long T2 with clear borderline in routine MRI. High intensity was observed in DWI. The sensitivity and accuracy of combination DWI and routine MRI were 90.9 % and 91.7 % respectively, which were higher than those of routine MRI or DWI （ P 〈0.05）. Conclusion： Detection rate of non-palpable testis could be improved by combination diffusion-weighted imaging with routine MR imaging.