目的 探讨高分辨率MRI在肛瘘术 前诊断中的临床价值。方法 60例经手术 证实的肛瘘患者术前均行MRI检查。回顾 性分析MRI各序列显示的瘘管、内口、外 口、脓肿及肛瘘分型，然后将MRI诊断结 果与手术结果对照。结果 MRI显示高位肛 瘘15例，其中高位复杂性肛瘘9例，高位 单纯性肛瘘6例；诊断低位肛瘘45例，其 中低位复杂性肛瘘25例，低位单纯性肛瘘 20例。MRI诊断瘘管97个、支管18个、72 个内口、70个外口及9个脓肿；与手术结 果相比，MRI诊断瘘管的准确率为95.1% (97/102)，检出内口的阳性率为94.7% (72/76)，MRI显示外口位置、数目及肛周 脓肿范围与手术结果一致。结论 高分辨 率3.0 T MRI术前诊断能够为临床治疗肛 瘘提供较全面的解剖和病理信息，对临床 选择正确的治疗方法具有重要意义。

Objective To study the clinical application of 3.0T high-resolution magnetic resonance imaging (MRI)in diagnosis of anal fistula. Methods 60 patients with anal fistula underwent 3.0T MRI scan before surgery. The MR sequences were evaluated for demonstration of anal fistula, intemal openings, external openings, abscess and types of anal fistula.The MRI findings were compared with surgical results. Results On MRI examinations, The high position anal fistula was found in 15 patients, 9 patients had complex anal fistula, 6patients had simple fistula. The low position anal fistula was found in 45 patients, 25 patients had complex anal fistula, 20 patients had simple fistula. And 97 fistulas, 18 branch of fistula, 72 intemal openings, 70 external openings, and 9 perianal abscesses were detected by MRI. The diagnostic accuracy of MRI for fistula was 95.1% (97/102), the positive rate for interna1 fistula was 94.7% (72/76), The site, number and perianal abscess of external fistula showed with MRI was the same with operation. Conclusion High-resolution 3.0T MRI may provide more comprehensive anatommic and pathology information for clinical treatment of anla fistula, has great significance to the clinical treatment.