目的探讨常规MRI检查联合扩散 加权成像序列在未降睾丸的诊断价值。方 法 回顾性分析18例经临床手术证实未降 睾丸患者的完整影像资料，所有患者均行 常规MRI检查（T1WI、T2WI-FS、增强）及 DWI检查。采用双盲法评估并计算MR常规 检查、DWI联合常规MRI检查对于隐睾诊 断的敏感性、特异性、准确性。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-FS、增强检查及DWI的敏感性、准确 性分别为94%与94%，高于常规MRI检查。 结论 联合应用T1WI、T2Wl-FS、增强检查 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 explore The diagnostic value of combined diffusion-weighted MRI with conventional MRI in undescended testes. Methods 18 cases confirmed undescended testes by clinical surgery and pathology were retrospectively analyzed, all patients were performed routine T1WI, T2WI-FS, enhancement and DWI. Double blind evaluation and calculation of routine MR sequences, enhancement and DWI were adopted for diagnostic sensitivity, specificity and accuracy examination of nonpalpable undescended testis. Results The findings of the cryptorchidism were long T1, long T2 signal with clear edge, high signal intensity on DWI. With the combined application of T1WI, T2WI-FS, enhancement and DWI, the sensitivity and accuracy were respectively 94% and 94, higher than that of single application of conventional MRI examination. Conclusion the combined use of T1WI、T2Wl-FS, enhancement and DWI is helpful to improve the accuracy of impalpable testis on localization and diagnosis.